This is a complete incorrect claim, and spreading misinformation. What looks like the LAPD destroying their own vehicle is correct in a way. That said police vehicle looks like it either was involved in an accident, or more likely, was destroyed by protesters. According to California Vehicle Code, Vehicle Division 12, Chapter 4, Section 26710, within California no person may operate a motor vehicle if their front or rear windshield is impairing the view for the driver.
"26710. (a) It is unlawful to operate any motor vehicle upon a highway when the windshield or rear window is in such a defective condition as to impair the driver’s vision either to the front or rear."
Therefore, the LAPD would have to remove the front windshield and/or rear windshield in order to operate the vehicle to take it to either their impound lot, or repair center. At no point was this to be blaming protesters, but to follow the law they have swore an oath to protect.