If 51% of the employees would benefit from firing the other 49%, you'd be as good as gone anyway. Not saying it would be worse, but the same incentives are at play.
No, because the average employee has both a lot more in common with their peers and because the gains are lower for people whose stock shares are orders of magnitude lower. Joe from accounting isn’t laying off a department so he can sell shares worth the price of a Corolla before taxes.
"Joe from accounting" would perhaps do it for free, if he thought it would affect the slackers. I've seen colleagues cheer at the news of layoffs because they saw themselves as the rockstars being dragged down by "useless office drones".