"Not Too Shabby For Folks Who Got Kicked Off the Station w/ Nothing" - Drack Krogan

They probably got kicked off the station for bending the rules and then started growing up an anarchist society by rooting together on one of the pre-habitated areas. Could even be that Kett or other hostile Andromedan races take advantage of it by allying themselves with them to create more opposition.

What makes me more curious is how people are accepted into the Initiative. How could these anarchists make it there? They must've had some credentials that made them qualify and then it really surprises me they can go rogue like this, and how primitive they seem.

Perhaps they're part of some civilian Nexus program. Who knows.

I think they don't get executed because the Ai is a civilized program. We know what is at stake but most of the management is probably well organized and the population is safe enough for a few stragglers to not shake things up too much.

There was also a Milky way shuttle in the upper right corner in the gameplay footage when they land at the settlement. It could be anything but it instantly reminded me of Cerberus's shuttles in ME3.

How does this help Cerberus though?  Their goal is to advance humanity (and only humanity).  What good does it do for the cause to get people kicked off the AI?  Especially that early on?

Cerberus is freaking stupid, nothing they do really helps "humanity"(unless you think like TIM that "Cerberus is humanity" or some deluded shit like that), only hinders them and hurts them.

And they better not be in this game, THEY BETTER NOT BE IN. Or I swear to God I...

Oh, I'll tell you why! It's my old pet-peeve about total lack of imagination of many writers (BW might top the list here), and I can rant about it for hours.

For some unknown reason, a lot of fiction writers convinced, that "free world can not exist without criminals and there is absolutely no way to get rid of them". Remember Babylon-5? You should, after all ME took so much from it they could call it Babylon instead of ME. A space station with scarce strongly controlled resources and diplomats as main inhabitants (the station was build as diplomatic mission). Yet, there are criminals freely living there and threatening said diplomats.

Can you imagine criminal bands in,  idk, White House? I mean, aside the government? Simply living in the basement and security does not dare to step in those occupied floors? Well, apparently, BW writers can. Hence, "new Aria". Sure you loved Aria since ME2, right? And could not get enough of her? Well, here is her new incarnation. Enjoy! 

Or they find out Shepard took down Cerb 600 years ago and say screw it

She looks like she's about fifteen years old. 

That's one of the few missions where even my Paragon Shepards go Renegade, at the end at least. 

There are over 20k people from every of the 4 species. I doubt that they were all 'selected few'.
Beside, I disagree. Exteme and critical situations might bring the worst of people.

Not really. It's more like having people using their role in the military to smuggle drugs. Something which has actually happened, several times, in all kind of places.

It would not be unexpected either for the Andromeda Initiative to look for military, police or security personnel with strong Type-A personalities, as they have often display excellent leadership skills and ability to respond quickly in crisis situations. When going to a completely new galaxy with unknown dangers and threats, those people would be vital.

The downside however is that some of these Type-A's might end up reacting poorly to what they perceive as poor leadership, especially given that the Andromeda Initiative is a civilian-lead operation, so may not take military considerations into account that would keep colonists more safe.

This is not meant to disparage the military, police or security personnel (in-game or out) or tar them with the same brush when it comes to personality type. Nor say that people with Type-A personalities wouldn't be present in the civilian leadership as well, as they are equally necessary and prevalent in those working in government. My point however, is that people who do have good leadership qualities, might end up finding themselves at odds with those who don't, yet who hold a position of authority over their community.

Likewise, difference species might have different priorities in mind when it comes to setting up shop in Andomeda. Krogan and Turian colonists in a settlement might want to dig in as soon as possible, to secure their new holdings, give them somewhere fortified to expand from and provide a good fallback position in a crunch. Asari, Human or Volus colonists might instead want to focus on exploration and setting up trade, while making security a secondary concern.

Thus conflicts over the direction of the Andromeda Initiative is to be expected, because not everyone will agree what direction they should take and how the colonisation efforts should be run. Some might feel security is too lax, some might feel it's too tight. Some might feel that the colonisation is going too slowly, while others might feel that rushing in would be reckless.

People splintering off to form their own factions is inevitable, whether born from a desire for independence, their own piece of the action or feeling they could do it better.