I think this sort of person definitely exists

There are people who are simply careless

There are people who think of the 3d printer as a toy, not as a piece of industrial (or semi industrial) equipment

There are people who are arrogant, who think they have figured out and solved anything that could possibly go wrong so they have made it safe to do

There are people who kind of think they are invincible and are just convinced that bad stuff won't happen to them

Idk. It's not a stretch at all for me to imagine this sort of person, based on the people I've met in the past. I mean people remove safety guards from power saws that are designed to protect you from losing fingers, so...