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Article explains why:

Pence says the police officer who ran into the bar told him that he had swerved to miss a dog in the middle of South Broadway. Pence says he does have security camera footage of the crash, though he is not making it public at this time.

Cop made up a dog as an excuse, and the bar has videotape that likely shows no dog.

And when cops are challenged, they arrest and beat people.

Which is likely why an owner was sent for medical treatment after the arrest despite not being injured when the cops took him away

Seems like a good bet they tried to violently coerce him into deleting it or at least to stop talking about how it proved the cop was lying.