I agree that in default should works the way you say, but that is theory, in practice it is not what actually happens a the OP found out. And we need to acknowledge the reality that people does not behave as theory, law, or whatever other abstract term expects (the law is so abstract that it needs a punishment machinery to be respected, it is not natural at all, and while some people will surrender their free will to goverment compliance, others will not, not even under the threat of heavy legal pain). Not realising this fact of life is naive.
You can go around beating people over their head for their wrong doings (natural or artificial), and if that makes you feel better about yourself or your position then take your measuring stick and go on your merry way.
I, on the other camp, rather attempt to figure out how people actually works, and make decisions accordingly.
Try to understand how things work vs. Do a I say or I'll beat you up. I guess that is one of the differences between tinkers and lawyers.
One book that explain tis concept better than me would be Nudge by Sunstein and Thaler.