I Hate Animal Cruelty [I Am Against Animal Cruelty]

Reading about this human head transplant that probably will take place at the end of this year, I focused on the previous experiments made with dogs and chimpazee's heads.
I can't avoid thinking that if Science's advances would depend on me, it was stuck as a post.
I feel unable to see an animal or a person suffering bc of me.
Said that, I'm very hypocrital bc I then feel happy with how Science helps people to live more or with best qualities of life.

I have contradictory feelings.