when you put up all the posters you collect with thumbtacks, it just makes all this stolen art fuss trivial. this isn't fine art, this doesn't have to play by any rules.. it could steal any image it wants and wag it's wiener at the world.
nobody should give a shit
it's not like this guy is selling these. it was used to promote a small show and if it weren't for this site, this poster would be gone from the world 10 seconds after the show was done.. it's ephemera... so, the guy probably just picked a bold interesting image to use, without much thought to artistic infringement and blah blah blah...