that's marginal though, as people might be, at the margin, shifting the places they go, rather than not going anywhere (covid lockdowns excepted). so that might induce a marginal change in incident rates, but not anywhere near at a magnitude to warrant a change of behavior.

the biggest threat in our urban walking lives is really cars[0], and even that isn't so large that we should remain in a state of constant fear.

[0]: pollution is actually the biggest (external) threat, since it's estimated to be responsible for millions of lives lost annually worldwide, but that's regardless of urban walking, so it's beyond the scope of the argument here.