Were he in jail, without meds and/or therapy, he would most definitely hurt a staff member or another inmate. Do you want that? I should hope not. I believe he should never be released, but for goodness sakes it's just an escorted walk. Maybe there should be a fence, but if he's taking his meds, and has increased security guards, then I'm not too worried about anything happening.
There's a reason why we're proud to be Canadian. Because we value a little thing called human rights. We are also supposed to be evolved enough to recognize mental illness, although some of us seem to still be down there in medival times.