Transportation crime fear is compounded by another issue: "scary people." I've personally never witnessed a crime. But I've seen plenty of people that raised my hackles, usually they seem intoxicated or are exhibiting some kind behavior that may indicate mental illness. Are they going to get up and stab me? Probably not, but it sure seems like it could happen, and it sometimes (though rarely in terms of transite miles) does happen. I can intellectually dismiss other low prevalence issues in a way that it is hard to do with public transit, viscerally.
I know you meant "became wary" when you wrote "raised my hackles", but that phrase means "to (visibly) upset or arouse one's anger," which I'm sure is not what you meant. But it does speak to a large part of the problem: people becoming overly engaged with something that they should probably just acknowledge and be aware of, without changing their behavior significantly.
Crime hysteria seems like it gets people, who are unlikely to be victims of crimes but more likely to have outsize political influence, involved in law enforcement policy. Without being forced to dogfood the results of their own advocacy, you end up with policing rules written by people who rarely are forced to interact with police, and who are very scared of crime that never happens to them.
