Abundant supplies of low cost energy rather than restricted supplies of high cost energy would replace another, effective, crippling tax increase with an effective pro-growth tax cut.
Even if we felt it was very effective, it would take a very substantial amount of time to develop adequate supplies so that someone could actually get the vaccine in their local communities.
An American attack would be more effective, but it would take longer and probably lead to real warfare in the Persian Gulf, disrupting oil supplies and producing global responses.