Understanding had nothing to do with it.
Regardless of his status as a LEO his leg and shoulder were broken and he was defenseless against two adult males stomping him to death.
Anyone would have been justified in using lethal force at that point. The fact that they knew and didn’t care that he was an LEO is just the icing on the cake.
Did you read the article?
Apparently not. Maybe just the headline. Given the rancored prejudice reflected in the post, it may not even matter if he read the whole article.
A police mouthpiece claimed that the officer identified himself.
The police are allowed to lie to the peasantry. It's settled law. They could be lying about him IDing himself.