So we should continue appeasement?
We should have continued negotiation and reinstated the nuclear treaty, which Iran was complying with. Sanctions and negotiation to force them to behave responsibly.
We have never appeased Iran in the sense you are portraying. Iran has no reason to cooperate now, and the fallout is already beginning...in Iraq.
Actions always have consequences, and poorly planned actions tend to have bad outcomes.
Bad guy, but killing him will create more problems than it solved. His replacement will behave in the exact same manner, and now Iran has an incentive to avenge a national martyr.
Trump's foreign policies aren't well thought out nor do they seem to have specific outcomes in mind.
Kill bad guy, rally base, and deflect from impeachment.