Someone died though. The polite thing to do would probably be to say nothing at all ...
This "dead people are off limits" thing is a relic from the superstitious dark ages. If we can praise the actions of dead people, we can criticize them too.
Freedom to express isn't freedom from bad responses.
I think XKCD had it right -- people should have to listen to their comments read aloud before they're published on the internet.