It's not a straw man. Go back and read JoeCortopassi's comment [0]. He didn't propose the argument then knock it down. He genuinely presented the argument as his own. He says neither will work unless implemented completely, then he recognizes that there are problems with either and that some crazy people will always be able to commit heinous crimes.
Your argument is that the two absolutes are not the only options, which is pointing out a false dichotomy. Of course, even that's not an appropriate response, since JoeCortopassi had already pointed out the potential problems (like excessive loss of personal liberty) with absolutes.
[0] http://news.ycombinator.com/item?id=4922651