Most laser pointers are class IIIb laser devices. The class III means not at all eye safe (though it isn't a burn hazard and you don't have to worry about specular reflection from a target other than a mirror.) The b part means that the manufacturers spread some money around to come up with a class of lasers called, "sure it isn't eye safe but really no one is going to shine it directly in their eyes, will they?" But now they are so cheap that people can buy them as if they were toys. What do you think the chances are that some parent will buy a laser pointer for a child (or maybe someone will just carelessly leave it out) -- then the child (thinking it is a toy anyway) will shine it in his eyes just to see what happens. Heck I would be really surprised if this hasn't happened already.
On a side note I would imagine that if the plane were at a very high altitude then it would not be as easy as you may think to shine a laser pointer on any part of the plane (let alone into the cockpit window.) Then again if the plane is at a high altitude then a beam from a common laser pointer will likely expand enough to no longer be that dangerous. I guess this is only a when the plane is very close to the ground almost immediately after a take-off or right before a landing.
If this really continues to be a problem then maybe the government should step in and only allow laser pointers to operate at certain wavelengths. Then Boeing and Airbus can put coatings on their windows to block those wavelengths (turn the cockpit window into a giant set of laser goggles.) Or maybe people can just stop shining laser points at airplanes. Just because something is cheap doesn't mean it is just a toy.