Entirely agree. The people responsible for trump getting votes are the people voting for Trump.
Tactical voting is bullshit of the highest order and the undeniable sign of a fucked up political and voting system, not some sort of political astuteness.
If your voting system can't allow people to express their true choice, you should throw it away. Yes, that means the majority of voting systems around the world are bad and need to be changed. Getting people to recognise that this is even an issue in the first place is a huge battle.
This is a perspective than can only be held in a political system that has devolved to a two-party system.
If you step out of that, it stops making sense. A democracy allows for people to express their actual opinion. Anything less than that is not a proper democracy. I'd argue there are no "third parties" in a proper democracy.
You might be saying that the American regime is illegitimate, it's unclear.