For the prospects of the freedom and subsequent prosperity of the oppressed Iranian people, peace in the Middle East, and safety of the commercial shipping routes, I fully approve my tax dollars to the matter.
Likely the actual goal, as dictated by Israel and the Jewish Lobby in the US, is to destabilise Iran long term in a sort of Syria situation, so they cannot threaten Israeli hegemony in the region.
Remember even a non Islamic Iran is still a threat to Israeli power if it remains unified and intact.