Thankfully the railways are run by sensible people who view the preservation of life and the prevention of accidents to be a desirable outcome. Even when in the opinion of some enthusiasts it's possible to pin all the blame on the victim and say that they should have known better.
Accidents happen because people make mistakes, they make bad decisions or don't think things through properly, or maybe they're just unlucky. No-one's journey home should be ending in their death though, the fact that someone makes a mistake or a bad choice does not in the slightest mean that it's ok to blame them and do nothing about it.
I hate assigning blame to human error. Barring suicide (which is tragic and all efforts should be made to prevent it also) people don't end up dead or seriously injured on the railway by choice. If they or someone else made a mistake or a misunderstanding that causes an accident then we need to find out why or how this came to happen, what other factors influenced how they made a decision. In the case of droplight windows on trains there's usually only a small warning sign which doesn't really communicate the nature of the danger. Similarly passengers rarely ride trains equipped with them and don't fully understand the risks. Do they know there could be little/no clearance from branches and less than 30 centimeters from static obstacles?
No good reason for doing away with them? People being killed is a good enough reason in my book.
I'm sorry that you hate assigning blame to human error. Windows are there to provide ventilation and in some cases, open the door. If you decide to use them otherwise, that's your own risk.
As someone with a lot of experience in rail safety, I think that's a shockingly ignorant opinion. If you took it to it's logical extreme, we wouldn't bother doing anything after accidents, and the railway would still routinely kill a few dozen people at a time in horrific accidents.
Unprotected droplights are completely unnecessary on a modern railway, and shouldn't be kept just because a few enthusiasts like to stick their heads out of them.
I look forward to the day someone bans traffic, in case I decide to walk out in front of it.