Because part of the problem with playing your enemies game is that you are not your enemy.

Cheating, besides being low integrity and a violation of principles (if you don't have those please go hang out with the Left since they have none), also wouldn't work even from a tactical position. As you already can see, the Left are accusing the Right of cheating, but this time they can use the force of the judiciary and political enforcement as a weapon against the general population.

Cheating and violence is a great way to let the Left go mask-off and start mass arrests and gunning down protesters; along with decreasing their own legitimacy.

That kind of low integrity strategy doesn't build us legitimacy and is used as a weapon against us. Hence why people like you get called a "Fed" correctly.