Maybe you didn't read the rest of my post. I'm very happy to show good manners to people I meet or know (or indeed to people like you on message boards, at least in so far as it's reciprocated), but why should I show good manners towards the decomposing corpse of a public figure I despised, and who did so much damage in their life (in my view)?
Because if they're dead, they can't hear you. Their life is over. Done. They are dust. Better to stay silent than protest to someone who has gone.