Well Trump was the President in 2020. But if you read what I wrote you would see that the blame actually falls on State and Local leadership and their actions and policies.
So if for example in Philadelphia, in 2019 we had 355 homicides. We have a Democratic Governor, a Democratic Mayor, a Democratic DA and the a Democratic Police Commissioner. That leadership saw $21M in damages during the George Floyd looting/riots/protests. The response was not to call in the National Guard immediately. Instead, the Police Commissioner made the police force stand down and within the first week of George Floyd changed internal policies including banning the use of non-lethal weapons like tear gas. The DA has spent the last 4 years of not prosecuting criminals. The result was Philadelphia had 499 homicides in 2020. But the same leadership remained even though there was a big push to try and get the DA out to get a more tough on crime DA. The result, Philadelphia set a new record in homicides in 2021 (535) and we still have a few weeks to go.
It seems like in the political forum, everything has to revert back to Trump. I don't blame Biden, it was mostly Democratic leadership and their progressive criminal policies that are causing a spike in violence.