Kill a cyclist, get community punishment

No, I was quoting you. You said that in order for me (as a cyclist) to be respected by motorists, other cyclists need to start behaving responsibly. You stated in your own words that motorists display an outgroup homogeneity bias against cyclists.

I was replying to this

That is exactly one cyclist being damned for tha actions of another, even if they've never met them.

Replace the word cyclist for motorist ...

Besides if a vast majority of cyclists ride like dicks, it is easy for someone to assume that every cyclist rides like a dick. Yes guilt by association is shitty, but it is going to happen unfortunately unless majority doesn't behave like that.