I don't see where criminal fits in aside from the fact that a sabotage of that sort would rightfully be hideously illegal. What is to gain personally from that

I don't see where criminal fits in aside from the fact that a sabotage of that sort would rightfully be hideously illegal. What is to gain personally from that destruction? It might be a pedantic quibble but I can see power as the only "rational" sabotage motive. Which could include some disgruntlement. Either to oust management or rivals to gain control or possibly international politics where one thinks they can gain from the loss of the colony for the sake of their earth nation. Suicidal can be taken as granted to be irrational and disgruntled relatedly as "so fed up they want to see everything collapse to make them suffer".