He's been described as the second most powerful man in Iran. If you don't like the VP comparison how about the Secretary for Defence? Or the head of the Joint Chiefs of Staff? It was an assassination of the senior member of their establishment/military who is not a member of a recognised terrorist organisation, has not been charged with anything by any credible body etc etc.
You're being disingenuous and you know it. And you've avoided the two main points. 1) if this does result in a significant escalation including instability and violence will you really argue that one man's death was worth this? One man who can easily be replaced, possibly with someone worse? And 2) do you really think Iran is more likely to be less hostile, less violent because of this?
I think you know the answer to those two questions and are ignoring them so that you can revel in his death. Which strikes me as short term thinking. This was Trump at his worst.