You have a whole congress and senate to hold them accountable. If they haven’t, then why should a random prosecutor in a city court be able to issue an arrest warrant and prosecute the leader of the country?
Without immunity you’ll get the kind of shit they’ve done with trump, but against sitting presidents. Imagine if Obama had been arrested every time he entered Texas because the locals just feel like prosecuting him to send a message.
We don't have to imagine, because it didn't happen, because it's not and was not and won't be a real problem.
Okay, but now that hypothetical problem is solved, we have the opposite hypothetical problem. Let's see if it turns out to be more of an actual problem compared to your imaginary one, which never materialized in 250 years of the presidency.
My guess is it's going to be an actual problem almost immediately, as soon as someone with low moral character is elected. Wonder how long that will take.
Without immunity you’ll get the kind of shit they’ve done with trump, but against sitting presidents. Imagine if Obama had been arrested every time he entered Texas because the locals just feel like prosecuting him to send a message.