I don't understand why really powerful people don't want him dead.

He's started a war that has caused massive supply chain issues, he's introduced insane tariffs that have ramped up prices for component parts and called supply chain issues, he's introduced hostile domestic policies that have reduced international tourism in the United States, he's threatened companies that try claim their tariff money back except CEOs will have to claim the money back or they'll get sued by their shareholders thus putting the CEOs in an impossible position, ICE keep raiding factories and warehouses arresting foreign nationals even though they're the only people who will work in those facilities causing workforce shortages, ditto for farms, and he's causing international incidents which are resulting in less global trade and a lack of demand for American produced goods.

Everyone's losing money because of this including the rich and powerful so they may decide that they want to replace him with someone who's capable of thinking through the consequences of their actions. Or at least someone who is more easily controlled.