Companies are making shooters for the ps3, because that's what sells in America.
Sony is not making these games. Companies will simply come to them and say "we have this great...."- nuff said.
if shooters are coming out more than other games, then blame it on yourselves for either
a) renting games, or, not buying games other than shooters
b) buying shooters
so either
a) quit playing the blame game
b) gtfo