I believe they tried, but honestly he is probably more useful to them alive.
To quote Pezeshkian himself: “Do you know why they assassinate our capable individuals? So that weak people like me remain and cannot serve the people, and the enemy can then tell the public: ‘You see, they are incapable.’”
You dropped these, here you go:
Are we really supposed to feel sorry for this guy because there was yet another time where he blatantly ignored orders and violently tried to get into an occupied vehicle and hurt himself in the process? Because it's having the opposite effect 
They really gotta stop showing pictures of him being paraded around. Even in cuffs and custody this man has more rizz than anyone around him. It's really off the charts.
A year in and people are still at the "But, he can't do that!" stage. We are so truly fucked.
Ah, glad to find out the executive order "lacks the force of law", which means that none of his other executive orders have been enacted or enforced in any way either... Wait, what's this? They have? Oh. Oh...... Well then.
This person gives me "young girl during the Salem witch trials who accused people of being witches to get them killed just for fun and attention, and never faced any repercussions or expressed any guilt for doing so for the rest of her life" vibes
Holy fuck, "It was absolutely necessary for me to run over hundreds of people alive with my armored bulldozer" was not a take I was ready to read. I'm so sorry, it must have been really hard for you to have to do that.
If they can't get him, if he has left the country, it's at least fair game to blow up all of his things. Give him nothing but a hole in the ground to return to if he ever comes back. It's where he belongs.