I agree that some people should never own a dog!!! It is sad that some people will get a dog and ignore them so they can do whatever it wants...
But, to try and turn things around is a bit crazy I think for be neglectfull and won't take ownership to it.. I also agree that he needs to take ownership to the damage the dog created though, reguardless of what anyone feels about it.. He maybe acting out by trying to get you in a mess Mite but, with those pics and all I think you will come out pretty good.....

Ihopehis dog turns viscous and mauls him.

i can understand how you would feel about it, but, I think deep down you really wouldn't want that to happen. As it would only give more bad names to all dog owners.. Good Luck on fixing this situation though...