You have to read a bit into the article to learn what the guy did that would justify arresting him:
As the tension aboard the train escalated, the man whipped out his cell phone and took a photo of Stowe, who then snatched the phone and deleted the photo, police sources said.
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“I’m going to kill you right now,” Stowe said, according to cops and court records. He then swore at the man, according to cops and court records, and in an apparent reference to the Holocaust added, “They should have killed all of you.”
The man managed to swipe his phone back from Stowe and ran to alert the conductor, police sources said. As the train pulled into the Eastern Parkway/Brooklyn Museum stop, cops were waiting to collar Stowe, police sources said.
Be sure to note, mentioned earlier in the article, that Stowe wasn’t alone. If I was accosted like this by 9 young men I think I’d be less than buddy-buddy, too.