Yes. It's distracting to him and irritating to others
In some circumstances I suppose
I'm not sure
No, children cry sometimes, they have a right to ride the bus
I hate kids and they shouldn't be allowed in public
I've got no problem whatsoever with kicking them off the bus. Riding the bus is not a right, it's a public service. There are rules that must be followed when riding the bus and those who do not follow the rules, the mother in this case, ought to be let off.
Back when I had young children, if they caused a fuss, I automatically removed them from public places where they could bother others. Too bad many parents don't have that amount of respect for everyone else.