No one is arguing for the LAPD as a department. It is known to be corrupt and I don't disagree with you that many cops are terrible and many departments are corrupt but two wrongs don't make a right.
The terrorists that masterminded the Pan Am 103 bombing over Scottland all had very legitimate grievances with America. America had shot down a civilian Iranian airliner by "mistake" shortly before. That combined with our heavy handed foreign policy and unequal treatment when it comes to Israel is a legitimate crime against their nations and they had a very legitimate grievance.
But blowing up a 747 full of innocent people who had no say in any of these actions is not a justifiable reaction. This guy took what was a legitimate grievance against the LAPD and then, turned that into nothing short of terrorist actions. That daughter and her fiancÚ had nothing to do with the corruption in the LAPD; they were just unlucky enough to be related to a member involved in the situation.