I would bet a huge amount of money that @robertr and @SeattleTW would both curse police officers under the right circumstances. It would be hard to be more respectful of police than I am. As I mentioned before, my did was a police officer. My best friend is a police officer. BUT…I can promise you that if the police came up to me, and I cooperated with them, only to be badly injured, I would be cursing too. BTW- Johnson did not say FU to them. He said “how the F did this happen”.
If police were visiting your office to check for undocumented workers and suddenly asked you for your id I bet you would be polite and say “yes sir, here it is”. If they then, without warning, took you to the ground, slammed their knees into you and opened a major cut on your head I bet you would start cursing.