The problem is that for many things once something starts happening it is very hard or even impossible to stop it. It is way better to prevent something from happening than try to stop it after the fact - especially if someone with power can benefit from that something happening.
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Because hypotheticals have a process of moving into "stuff that's happening", on the timescale of years, decades.
Once it's starts happening, speak; if speaking doesn't work, fight; if fighting doesn't work, move. This works.
The problem is that for many things once something starts happening it is very hard or even impossible to stop it. It is way better to prevent something from happening than try to stop it after the fact - especially if someone with power can benefit from that something happening.