@gabriel
Thought I'd ask who 'they' is...

because I wrote something more (which could be wrong but will leave it here as it's good stuff for something else I was going to write)

The answer is: People are too scared and so they let things happen also or slide that way.

So as well as counting on 'nice' people and abusing it to increment environment into worse things people almost feed it by ignoring or not catching things earlier (with risk involved but they far from realise it will catch up with them or make bad things in some other way)

When being too scared people don't even stand up for themselves or others, for their own job, other people's, their own university changes, teachers, everything... so then what do you get?

All this helps in bullying and continuing things without the right swords of justice or organisation / speaking / leaking it.

(again wasn't clear who you mean but wrote that as I wanted to keep it anyway and will revise)