The overall trend in violent crimes like homicide has been down since the early 1990s:

https://www.macrotrends.net/countries/USA/united-states/murd...

There was a spike in 2020. If you wanted to blame an administration you'd blame Trump since it was toward the end of his term, but it almost certainly has more to do with COVID related mental health issues and disruption.

Overall crime rate shows a similar pattern:

https://www.macrotrends.net/countries/USA/united-states/crim...