Empathy can be toxic.

Judges let 18-year-old subway hijacker Justine Randall-Pizarro go, not once, not twice, but five times this calendar year in an apparent bid to show mercy.

But all they’ve really done is allow a clearly troubled teen to rack up a rap sheet of more than a dozen arrests this year, cause havoc on the transit network, inconvenience commuters and harass already overworked MTA employees.

Randall-Pizarro was busted for commandeering a locked N train at 4am in June, wearing a black hat and Crocs, then driving it one stop from the Broadway station in Astoria to 36th Avenue.

“I went to Broadway, and behold – there was a lay-up train there. Still on FaceTime with my homeboy, so I drove it while I was on FaceTime with him,” she told investigators. “And, I don’t know, we was

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