Of cource they should be aloud to adopt childen. I strongly believe we should all be treated equal. It doesn't matter if We're Gay, Straight, black, white, atheist, Muslim, Christian, ect. We are all human. Many people tend to forget that.
But, unfortunly... Most of the population doesn't see it that way. They child will most likely be harassed by their peers just because their parents are homosexuals. -__-