Yes, you are right. We should provide soppurt for not only for shia but also every people who are in danger of oppression. We are going to loss the face by providing infinite soppurt for Asad. Asad could not be a popular man in my opinion. Asad kills the people and killing is a big crime. Iran should replace Asad in Syria. Asad went a wrong way in a manner that the cost of providing supports for him is not reasonable.
Also Turkey is in wrong way. In this situation only extremist like Al-Ghaeda could survive. The danger of Al-Ghaeda is not less than PKK for Turkey. In my personal opinion Turkey & Iran are destroying each other in a the most stupid rivalry, history has seen.
I am not backing Turkey of providing NATO, that shield, but let us to have a look at world map, please. Are NATO missiles in Turkey could be in the way of our missiles to Israel?
US has gave the Israel advanced X band long range radar (which is part of missile shield installed in Turkey) and required missile technology to develop Arrow family missiles. Israel seems to be totally independent in missile defense system. To be honest at current situation Israeli system is in more advanced step compare to NATO shield.