alt Hacker News> It's vastly more expensive and difficult to react to violence on the subway than to keep violent people out with a small fare
Are you making a case that a violent person, who ignores the stringent laws of society against violence, will diligently follow the laws of society requiring $2.50 prior to riding public transport?
LOL
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Your argument is like saying I won't put a basic privacy lock on my gym locker because, you know, a creep wanting to sift through my things is going to do it anyway.
There is a cost benefit analysis that even serial offenders go through to pick a victim. If a transit system insists on fares, it is likely they are watching out for fare dodgers which increases the risk of getting caught even before the offender gets a chance to offend.
It means you can kick out an unstable person who has not paid $2.50 before they become violent.