OK, so I'm not a pilot, but I do know a lot about Lasers.
The issue here is with the small diode lasers that are sold as laser pointers, and as alignment lasers to the construction industry. The law on these items is that they should all be below 1mW, and hence fall into safety Class 1.
Class 1 lasers are inherently safe - in other words there is no way you can damage you eyes, no matter how long you stare into the beam. Which is why they can be sold without restrictions.
However you can find higher power diode lasers on sale, with 5 or more mW, which pushes them into Class 2 or even 3a. These you do have to be careful of, as they can do damage if you stare into the beam. This is quite hard to do in practice as you tend to blink and look away as the light light hurts, long before it actually damages you eyes. Even laser light spreads out as it travels (the narrowest laser spot we can put on the moon is five times with width of the moon!), so the damage peters out in a few metres.
Every so often Trading Standards cracks down on the illegal sale of Class 2 and 3a lasers as laser pointers, but given the flood coming in from the far east, they are losing the battle. They are the people who you should be complaining to.
Class 4 lasers are the ultra high power ones used for cutting metal and professional lighting displays. You need a lot of training before you will even be sold one of these.
The main hazard to pilots from nighttime lasers is distraction and temporary blindness. It is basically impossible to cause permanent damage from the ground, with anything you can buy over the counter (legal or illegal). It's the temporary blindness that is the major hazard to navigation, and why the sales of illegally high powered laser pointers should be better policed.
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