This is a 2-part question.
First, on 9/11, I watched quite a bit of live video of Muslims dancing in the streets when the towers feel. Including here in the US. What I don't remember seeing was official condemnation from Muslim nations. That's not to say it didn't happen. I just don't recall seeing it.
2nd question - yes, we do tend to be hypocritical. When it comes to capital punishment for murderers and baby rapers, we've got rent-a-mobs out there condemning it but when the pro-life crowd stands up for the unborn, the same rent-a-mobs decry it while shouting "Our body our choice".