We've already seen then commit numerous crimes, and even many serious and violent attacks that have resulted in the deaths of many innocent European citizens.
I expect to be vilified for this, accused of shutting down the debate with that "citation needed" thing, but seriously, I couldn't care less. I reject the "post-factual" paradigm, I only accept debate based on actual facts, not fantasies nor distorted "could have been" stories.
Regarding what to do about it, my preference would be to let the market decide the solution. A revenue neutral carbon tax would reduce income and sales tax (we ought to be encouraging income and spending so this is good) and it would send a price signal to move us from carbon into the new energy economy.
I like the way you think. The market is a powerful tool if it's properly set up, but can't come up with solutions on its own in many issues.
The Constitution sets up the patent system. Yes, it's Constitutional law.
Actuallly, the Constitution of the USA merely allows for it, it doesn't mandate it. Having no patent system at all would be just as constitutional as the current situation.
You can observe a lot just by watching. -- Yogi Berra