You need 270 Electoral College votes to prevent the vote going to the states for the Presidency. There are 538 votes available. The only way to have more than two parties compete and have the election not go to the House is if one party is unified and has large public support against the other parties that do not. This essentially creates a single-party state.
Ergo, our system is designed to have two parties, each with roughly half the population behind them. Anything more mathematically ends in a single party state.
Great deduction skills there.
Sure, you can't literally steal a vote, but either you're unfamiliar with American colloquialisms or being deliberately obtuse. It's a term that describes exactly what you're doing here - actively trying to convince people to vote against something using deception.
Yes, you're being deceptive by trying to drive democratic voters to split their vote so the right wins. I have yet to see you make a single good faith argument here.