While it pains me that we as a society spend enormous amounts of money on some of these types, I'd rather have it this way than mowing them down in the streets. Sure, shoot them in defense if necessary, but our gov was made so that no one leo could be judge, jury and executioner for a reason.
Due process is a CRITICAL PART of our legal system for a very good reason. If you allow them to skip it for a bad guy, they can skip it for you too and I'd rather be alive so I can have my day in court, thank you. Oh yeah, without due process you may never get a day in court. Don't think it'll work like that? Maybe it would, maybe it wouldn't... One thing is for sure and that is that I most certainly am not willing to have my natural born rights stripped, nor will I sit idle while some bureaucrat says that it's OK to execute even the most violent criminals in the streets.