It's the stated reason why the United States has an impeachment process. So that they have a process for removing undesirable heads of state without resorting to assassination.

True but other countries don't have an equivalent process.

Most have, but the decition is made by the local politicians instead of foreing nuclear powers. It's actually very similar to the impeachment.

Sorry I phrased that poorly. I meant countries have no means to impeach a foreign head of state so impeachment only serves as a power check if the citizenry disapproves.

Not that I think heads of state fearing for their lives from airstrikes is necessarily good, being able to act with impunity is certainly bad.

The US has a constitution as well? It seems pretty worthless these days since nobody is willing to enforce it..