Iran's president is embroiled in a conspiracy, involving Americans. Because during the war between Israel and Palestine, Iran has the biggest support for the Palestinian side. So it doesn't like either America or Israel to attack the air route. Maybe it was a ploy by the pilot because if he had controlled the plane properly the plane would not have crashed.
From the current investigation, there has been no trace of foul play in the helicopter crash. Further examinations are going on to determine the cause of the crash. I don't understand how you expect a pilot to control an aircraft that has developed a fault in the air or going through turbulent weather conditions. Many presidents and top businessmen have died from helicopter crashes, so it could be just an accident.
I will say that what generated the death of this president is because of a political crisis because before a president take off with a flight or helicopter to travel to a mile 20 to 50 km away from the Residence of Presidential Villa those there to most of undergo test from the engineers to know they capacity of it so what happened to this president is a political coup
The president didn't take off from the presidential villa but from Iran’s border with Azerbaijan after the inauguration of a dam project. And I am sure Iran has some of the best aeronautic engineers that would have certified the plane safe to convey the president. There have been no reports of any power tussle in the Iranian top political hierarchy, so you are just speculating without proof that he was murdered by his people.