The Democrats are at war. They have been for decades. They will use any tactic against the right because it's war.
Republicans need to stop thinking that if they're just nice to Democrats, they can have peace. John McCain should have learned that when he ran for president. In the years leading up to his run, the Dems feigned peace with him because he could be trusted to vote their way on many occasions. But the moment he was the Republican nominee, all peace was abandoned and no attack was off limits.
Shockingly, even Trump needs to learn this. Leading up to the election, he talked about locking Hillary up for her various felonies. But when he won, he opted to be magnanimous and say she should be left alone. How did the Dems respond to his magnanimity? By relentlessly pushing to have HIM charged, impeached, etc.
If Trump had stayed the course, all the talk since November would have been about locking Hillary up for her (real) offences rather than attempting to discredit Trump for imaginary ones.
You can't have peace with Nazis or Democrats or any other fascists. You need to oppose them and their poisonous ideas relentlessly.