While you are certainly correct regarding Iran's reaction to the assassination of Gen. Suleimani, I note that you seem to regard the creation and continuous deployment of ISIS by the US and the West generally as unimportant. Perhaps you are not aware of the fact that ISIS is the means the CIA used to create the incomparable profit center the ME has become for war profiteers. If so, I commend you to the necessary research to ascertain the relevant facts, today matters of public record.
Stupid is as stupid does, so sayeth the sage. Whether or not Suleimani was a terrorist or Iranian hero matters little in a global conflict in which the last President of the USA deliberately assassinated an American child without even an accusation of any criminal act whatsoever. If American President's have been handed such precedent, which, again, is a matter of public record, being surprised that they feel authorized to assassinate foreign military personnel is incredibly naive.
Any presumption of lawful governance is ludicrous. Power is the only limit Trump can be expected to respect.