Not a surprise, really, but here's some data and analysis:

What we found is that Clinton voters with conservative views on crime, policing, and public safety were far more likely to switch to Trump than voters with less conservative views on those issues. And having conservative views on those issues was more predictive of switching from Clinton to Trump than having conservative views on any other issue-set was.

This lines up pretty well with trends we saw during the campaign. In the summer, following the emergence of “defund the police” as a nationally salient issue, support for Biden among Hispanic voters declined. So I think you can tell this microstory: We raised the salience of an ideologically charged issue that millions of nonwhite voters disagreed with us on. And then, as a result, these conservative Hispanic voters who’d been voting for us despite their ideological inclinations started voting more like conservative whites.

"Defund the police" is like "we need more charter schools" in urban areas:  it focuses on a symptom, rather than the causes of the problem (police violence, poor outcomes in urban public schools).  (Earlier discussion.)