You should care about other people safety no matter what. As a driver - if I can prevent an accident - it is my moral responsibility to do so - even if the other party is blatantly breaking the rules.
I mean this only in that bicyclists like to use "I am just doing what keeps me safe" as justification for behaving like an asshole and endangering others. I still suggest trying to avoid accidents no matter how much of an asshole the other party is.