> That information is easily available other places

Often ease of access in the moment is all that matters. If there's a gun nearby you might shoot someone or yourself in a heated argument, but are less likely to go and find/buy one to use. Someone who's stopped from attempting a suicide will likely not try again (70%)

A bored/depressed/angry/curious person might try to build a pipe bomb if they can find out how easily, but are less likely to put in effort.

Most adults in Switzerland have guns at home from military duty and none of this is happening. If this claim had any truth to it you'd see significant gun involvement in neighbour disputes and that simply doesn't happen.

Depressed people usually don't have the energy to get out of bed so they're even less likely to think of hunting down instructions on how to build pipe bombs.

Mass media really has people being scared all the time.