Isn't it stupid of couples to cram cake in each other's faces?

As a wedding guest, I find it embarrassing. In cases where it is obvious that one of the people involved is surprised and displeased by the other's action, it is enormously embarrassing. 

I'd much rather have that versus people getting drunk, the makeout sessions on the dance floor, etc.

Agree. Cutting the cake and feeding it to one another is supposed to (or was supposed to) symbolize nourishing one another.

Why does the world have to revolve around your preferences?

Why do you need some sort of validation from strangers on Yahoo?

It's become a 'tradition', but I think it's a waste of food. 

Yes, its very stupid, what idiot that started this needed his/her butt beaten. I warned her, and she listen to me, because she knew what id do if she had.

IMHO it is but it's not my place to judge what others do with the cake they bought for the wedding they paid for. At the very least couples who do this can't be considered as vain as those who have to try to stay perfect so they look good in pictures all day. 

It breaks the tension and they married each other to show love.

The 'cutting the cake' ritual at weddings got out of control with the cake smash. It was bad enough with feeding each other cake.