Why? We already have brain interface links that do similar damage to neuralink, this isnt unusual or unexpected. In its current form it is rightfully used on terminal patients with locked-in syndom. In other words, people before it damaged their brain in a meaningful way and whom cant be further paralyzed.
It would give these people a chance at someinteraction with the real world... What happened with the monkeys was about in line with other neural interfaces, its a consequence of the limits of the tech not negligence.