It's about general safety. People having misconceptions that a gun always requires a significant pull to fire can be dangerous in the wrong circumstances. Yes, a gun with a light trigger is a thing, and people should be aware a gun doesn't always need a significant pull to fire.

Also, to get there it had to be loaded, cocked, and pointed recklessly before we even get to the trigger pull. This is why in any country with any sense at all, you need to be trained properly before you can even think about owning your own firearms. Your right to self-defence does not mean your right to be a threat to the health and well-being of everyone in line of sight.