I feel like you're asking people to believe these things simultaneously.
- killing 180,000 people with political violence and counting is fine
- Trump is evil and will kill everyone with political violence end democracy, elections etc.
- Don't use political violence to stop this one guy though that's wrong.
- losing based on rules and norms we want to uphold is the point even if it ends the rules and norms.
They are asking you to have mandatory operating assumptions that you can't even say out loud.
I don't think there's ever been a time where more voters have had to feel in their gut that the things that Democratic party says they want are completely incompatible all the actions they are willing to consider taking.
There's no real way for liberal actors in our political system to talk about political violence in a way that makes any sense, since they're all theoretically targets. So they have to say bad. Impeachment (and a confirmation of it) is the only legal process intended to serve as an alternative to assassination, but it failed with regards to Trump and this time he's just a candidate.
Using violence to stop someone is also a slippery slope because objectively Biden is responsible for far more human life years being lost than Trump though, no matter how one slices the data. That's the difference between being a middling businessman mostly licensing their name and being president 4 years versus a 50 year career politician who championed all of the US' worst moves both at home and abroad.