I can see some logic in that. He's a young face, and they are desperate to appeal to more young voters. He is fully indoctrinated into the far left religion, so he's politically reliable. He has a huge public following, so he has a built-in support base. And he is a case-in-point for one the left's strongest political points, gun control.
He does have two drawbacks: he's a white male, and we all know how bad those people are

Also he's not female, so (presumably) he hasn't had any abortions, which would have made him even more attractive. A woman who survived a school shooting **and** had an abortion? unstoppable.
They are clearly grooming him for a political run. They'll give him this job to learn the ropes and increase his public profile, and then put him in front of voters.