I think this is more likely than some 'agent' plot. These people do not really care about countries, but what benefits them and their extended family. As Italians would say: "our thing".
Ouch.
I wish people who said things like this, or who believed that Trump is/was a Russian agent could see how silly and racist they look. America's problems are not caused by foreigners. They're caused by Americans.
The xenophobia exhibited by sentiments such as this simply demonstrate hatred and ignorance of the world outside of the USA, and demonstrate an incapacity to critically evaluate American culture and history.
So it's very fair to attribute the so called erraticness to what American want in general instead of attributing it to Putin or other non American.
Unwillingly? Sure. Being played? Sure. Knowingly being a puppet? No.
That being said, I absolutely completely agree with you that American problems are caused by Americans.