- Tempers get hot, which is bad for reasoned debate
- I like people who ride their bikes instead of driving cars, and I want more people to do more of that
So you don't like cars, therefore you punish pedestrians?I like walking around San Francisco, and I like not dying. It directly follows, then, that I want fewer people to drive, and for those that do to drive slower and more carefully. Riding a bicycle legally in the road encourages safer driving, improves bike and ped safety, discourages some driving trips and encourages other people to bike.
Your logic is infallible.
Riding your bicycle on the sidewalk does more to encourage the status quo of driving than would not riding a bike at all.