I was once passing under a motorway bridge, and some idiots dropped a rock onto my car. While not causing much damage, it was very startling. "Kids larking around" you may say. A few days later another car was hit, they were not so lucky. The windscreen was smashed, in the resulting collision the driver died.
I'm normally not in favour of knee jerk reactions, but in this case there is absolutely no need for handheld, high power lasers. There is a certain class of stupid people with reckless nature who will use whatever is to hand for the purpose of deliberate vandalism, and they either don't care or too stupid to realise the consequences, if people are injured or even die.
If there was a petition to ban handheld lasers, I would sign it.