I am not claiming this is true. But merely that if I was employed to destabilize the US, I would claim to have been responsible for a number of recent events in order to please my boss.
I am hoping the possibility of a joint common enemy can perhaps unite people in America a bit.
The guy who shot Trump in the ear had (arguably) no particular ideology or goal, just an interest in assassinations and a possible depressive disorder.
In that light, does it really matter what tier party the assassin belonged to? The joint common enemy you allude to is already inside the white house, and as long as that is still up for debate, the country has no future.