Do you all remember laser episodes on FIFA qualification match between Egypt and Senegal? FIFA punished Senegal's football organization for fan disorder during the match. Action quite justified as they have abused fellow opponents for a long time. Laser that is being used by so many countries should have fined but nothing happens to them. Otherwise FIFA continuous to be the joke association for others.
The problem with lasers is that they are very compact. Therefore, they are easy to carry into the stadium and use. If you remember after the vuvuzela ban, they were not heard anywhere - it is difficult to bring them covertly because of their size. It is irrational to punish the receiving party every time, since the laser can bring a provocateur to harm the receiving party. Although of course it makes sense for the stewards at the games to work more carefully and identify those who use lasers.