How about a mandatory negative AIDS test before entering a brothel?

How about having to prove that your aggression levels are low before entering any public place?

How about having to show your criminal record and being checked for traits of extremist ideology before going to any public event?

How about having the state check whether you are prone to alcoholism, violence, drug abuse, extremism, religious fanaticism or suicide before having children?

How about doing an IQ test before having children?

All for the greater good, so that you do not endanger others.