It seems to me that those "criminals" are anything but the real danger to humanity, as counterintuitive as it may sound! I will not deny psychopaths displaying antisocial traits may easily kill many individuals. Still, sooner or later, their impulsivity will take them to jail; thus, stopping their danger. Interestingly, what is more critical, in my sense, is killing people mentally and or psychologically. The calculative abusers are way smarter and more subtle in their games; hence, are never caught. Unless, kind folks start being aware of the trap and get the needed education, the victims ,umber can be limitless... That's killing humanity from within. That's the real cancer, I believe!