I want to ask that in Hussaini majalises, momineen are reciting salawat (durood) for the destruction of America and Israel. Is it valid and right to do it?

There are many good people in America. Perhaps there are members in the government who are corrupt just like every other country in the world. To pray for the destruction of the entire country is not necessarily a positive thing or the way of the prophet peace be upon him and his progeny. It is better to pray for the destruction of the corrupt people and their accomplices, lobbies and groups behind corruption, dictators and oppressors. Neither East nor West should be accepted or supported blindly.