What did Syria do to us?
Not much. It was the Saudis that attacked America on 9/11.
Syria has many Christians, just as Iraq did before Bush. The Saudis who own recent presidents decided that these Christians must be eliminated. Killing all the Christians in the middle east is long-term dream of muslims. The US is helping to realize it.
They did not join the muslim Brotherhood's Arab Spring and become a "peaceful democracy" like Libya and now Yemin.