I mean according to the article, technically they just tried to stop him over the $2.90 fare.
Then because of that he threatened to kill them and they realized he had a knife so they tasered him.
Then when that didn't work and he ran at them with the knife they opened fire.
Multiple people are still dead because they brought guns into a disagreement over $2.90, but the headline implies a lot more unreasonableness on the individual cops' parts as opposed to the overall policy.
Fair enough, supposedly they were wearing body cams so hopefully some of what actually happened can be answered objectively, I'm just pointing out what the article said. If he didn't make a threat or have a knife, then tasering him is a wild escalation, it's just that if he did, then the police can't really just let him get on a train.
Again, assuming what the article says is true, which is a big assumption, it's not that crazy to taser a guy who just got onto a train with a knife and threatened to you. At that point you're looking at a potential mass stabbing incident if you do nothing.
Again, who knows, maybe the cops are blowing his behaviour wildly out of proportion, I'm just saying that, based on the article, it sounds like he wasn't just gunned down for jumping a turnstile.