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If he wasn't mentally ill and was what we like to call a well adjusted person, would he have been carrying a bag of weapons?
There should be procedures in place to stop potentially violent patients with a history of mental illness from walking around unsupervised, but there aren't.
I am not focussing on Ian Ruby specifically, just using him as an example, what I am trying to get across is that individuals should not get themselves in situations where they could provoke a violent reaction from a stranger.
For example, I don't stare at other men's wives/girlfriends when in the pub, or remonstrate with a driver who cuts me up, as I have no way of telling if these people have short fuses or are just plain nasty, and have no problems hurting people. They don't have to be mentally unstable to do it, just easily offended.