People are demonstrating against the opening of Tropic Thunder because Ben Stiller plays someone who is mentally challenged.
Sure, I can understand these groups' points, but....
what about:
1) Laurel and Hardy
2) The Three Stooges
3) Jerry Lewis
4) Steve Martin in 'The Jerk"
5) Dumb and Dumber
6) The Waterboy, and probably every other character Adam Sandler has played

these are just off the top of my head, but we can go on and on.
So, can someone explain why suddenly Ben Stiller is being singled out for his role by these groups?

Apparently, these groups are being run by the mentally challenged.