If you forgo the impeachment process you are effectively saying that any President where his party controls the Senate can do anything he wants without ever being held accountable for his actions. The Republican Senate in the first impeachment tuned it into a political event where Trump was certainly guilty as charged but the Senate either out of fear of retribution from Trump's base or partisan political reasons failed to do their duty. But as Susan Collins said " Trump probably leaned his lesson". Tell that to the family's of the officers who died at the capital insurrection.