I think this is probably a bit selective, but I understand the sentiment. When I'm cycling I keep seeing awful drivers, and when I'm driving I keep seeing reckless and inconsiderate cyclists.

The awful infrastructure (poorly considered bike lanes, at best) doesn't make it easy to co-exist, either.

If they had proper infrastructure, they wouldn't have to choose between "being cars or pedestrians", they could simply be cyclists.

Usually this happens when there isn't dedicated bike infrastructure, both physical and legal and cultural. Of course they have to pick and choose.