Grants autopsy listed alcohol, coke and fentanyl in his system. He had his hand down the front of his pants and refused to be cuffed. THAT was the reason for use of a taser.
Have you read his rap sheet? In and out of jail. Even bleeding heart wikipedia isn't lying for him. It's all there in black and white.
This 22 year old was a thug, fighting and terrorizing other train passengers. He was ID'ed by people on the train. A couple other people had been caught earlier and they had weapons.