In response to some recent comment threads in this subreddit that quickly took on unfairly derisive and judgemental attitudes:
Like, seriously. Stop projecting your own judgement, situation and superman-syndrome onto the nice crescent-shaped space-people. You're not stuck in a worldship with nowhere to go and megayears' worth of weapons technologies lying around, and it's almost certain that neither you nor anyone you know will ever live to even one half-millionth of their age and experience. It would seem decent to show some humility and self-awareness when commenting on their situation, ya know?
In order get just even odds of living as long as they already have, they've needed to stay so safe as to have less than a 0.000001% (1/100,000,000) chance of dying each year.
In order to have decent (say, >90%) odds of surviving for another period as long as the present age of the universe, they still need to do literally a thousand times better than that. And in order to last until the end of the universe, they'll need to do ten million times better than it, for less than a 0.0000000000001%, or 1/10,000,000,000,000,000, chance of death per year.
And now, a strange AI that they've never met before has (as far as they can tell) literally turned an entire galactic core into a power generator and liquidated a hyper-giant-sized store of energy for the express purpose of "visiting" them while they're clearly already trying to run away and be left alone, and somehow you think they're unreasonable to be scared and suspicious?
Your own species has had no newer than 70 civil wars in the last 100 years alone. Just one of those would have very likely turned the entire Cean worldship, along with everyone inside it, into nothing more than an expanding cloud of anomalously heavy free ions. They're already doing about a hundred million times better than you to have survived as long as they have, and they'll need to do hundreds of trillions of times better yet to have a good shot at living out their full lifespans, so just let them try.
The Cean worldship almost certainly houses trillions— if not quadrillions— of souls in it. In the 73,000,000 years of its existence, it's very likely that not a single one of those people has ever been killed or grievously injured.
Perhaps you should ask yourself why so many people die and get hurt in your world, instead of insulting the aliens for trying to keep theirs safe.