xkcd

It's not like that. At that distance, the beam is wide enough to cover a large part of the cockpit, not to mention the glare. It's literally blinding light.

Have you ever had a truck flash its lights at you at night? It's like that, but much, much stronger, and you're in the most sensitive part of the flight, when if you fuck up, you crash.

What pilots are trained to do is switch off all the lights, so the idiot can't see you and can no longer easily hit you with the laser. You can imagine that's not safe either.