I also find it deeply concerning if non-violent insults or general lack of respect become conflated with violent threats/support or violence. Though obviously a private forum doesn't have to abide by the first amendment, I think the distinction is very important to recognize, especially when unsanctioned acts like these often result in increased hostility towards peaceful activists and marginalized groups. I'm reminded of how Black Lives Matter has been maligned because of things that BLM organizers never supported, encouraged, or condoned. And considering there are people, including journalists, who are currently facing 75 years in prison on dubious rioting charges because they were in the proximity of inauguration day protests, I think now is a time when we really need to be concerned about preserving civil liberties.
I do think that people need to act and speak responsibly, and that things like fear-mongering can help inflame anger and paranoia in an unproductive way. But most people don't become terrorists, especially in the absence of organized support.
Talk about respecting Trump and other politicians reminds me a little of the religious argument that atheists can't be moral people without God. Just as I don't need to believe in a higher power to have ethics, I don't need to see Trump or these GOP politicians as worthy of respect in order to believe that trying to assassinate them was wrong. They're still human beings, and we still live in a country that's supposed to be built on certain ethics. One of the issues dearest to me is criminal justice/prison reform, and believing in the importance of fair trials and sentencing for people accused of crimes but being okay with people trying to assassinate crooked politicians would be hypocritical.
We should be encouraging empathy and ethics, not respect. Respect isn't always possible, or deserved.
People don't tip the scale and become violent just because someone calls a politician by disrespectful names. They become violent because they're predisposed to it or because they're in a setting where escalating behavior is encouraged. If people start increasingly advocating violence, that's a problem because it normalizes the idea and implies that it's justified. But I haven't seen that happening.