>Do cops really "mow down protestors"?
Yes [1].
>The only cases I could find are ...
I am aware that Google's search quality has gone down, but surely not to that extent.
Or, as kids say today: skill issue.
> Alex Pretti who was armed at the time and arguably resisting arrest
> arguably
As argued by the people who killed him, of course.
In any case, ICE are not police, i.e. not cops, so I dunno why you would derail the discussion to ICE if you are talking in good faith.
Cheers.
[1] https://pmc.ncbi.nlm.nih.gov/articles/PMC7331505/