I am sorry this happened to you. What a nuisance to cancel your vacation and spend money on lawyer's fees!

I think you are overreacting to the case, though. If you adopt firm policies for yourself, you would not run into such situations. The policies should be: 1) no lending money to friends during this period of your life, 2) no visiting dangerous parts of town, 3) etc. - you get the point.

In other words, your mistrusting the whole humanity in reaction to this incident is an overkill.

Please see somebody about your suicidal ideation though!