>>I'd like to have a classification called "Too dangerous to walk around" for people like him.
>>After a cooling off period to be sure of the facts and to let the blood settle, if no one can come up with a convincing argument, I'd want him put to sleep.
>
>We have that in Canada, and apparently also in the States? http://en.wikipedia.org/wiki/Dangerous_offender
>
>[Update]
>Oh, sorry, misread your second paragraph, putting him to sleep, i see... sorry, nothing to read here.
>[/Update]

There are various forms of that both federally and in individual states that are designed to placate the populace that dangerous people don't get put back on the streets. Three strikes you're out, etc.

Generally these programs and statutes are useless as they are overturned/overruled/otherwise circumvented, allowing these kind of creatures out among law abiding people (sheep in their eyes) again.

I'm a firm believer in three strikes - you're dead. That's for crimes less than murder, rape, molestation, etc.

In those cases - strike one - BANG!