Time For A New Policy

In America and other nations in the West, most often someone must break the law before they can be arrested. Given the tactics of terrorists and anarchists here and abroad is this still wise? It might be worth deliberating whether to invoke a policy of pre-emption, which is sometimes employed when an enemy nation appears to be an imminent threat. If that is an option to prevent death and destruction from adversarial nation states, why can't we impose something similar for persons who have violent criminal records and who openly state or advocate, that he/she/they intend to kill, injure and/or destroy property?

Western averseness to adapt such a practice shows there is one force more powerful than law enforcement or public safety officers. It is the PC watch or police. These are somebodies who care more about how they feel than for the innocent people killed and/or maimed in our streets by miscreants, reprobates, militants and other criminal lowlifes.

Do not innocents have the right to be protected from militant radicals/activists who so often claim to be doing God's work? With ongoing inquiries/investigations by DHS into radical terrorists in every state, it's long past time to get them before they get any more of us. If enough red flags are raised by criminals and adversaries of the state, does it not warrant action(s)?