That's not very empathic of fellow people who might just have mistakenly forgotten food in the container.

It's not like they were intentionally using this for brewing some illegal substance or misusing it in a way specifically forbidden in the manual or obviously unsafe (e.g. removing a magnetron and all of its protections from a microwave to make pretty wood carvings).

Luckily I got one of the valveless models, and you bet your ass I'm keeping it. Maybe I'll stick an "open away from face" label on top or something, but I'm not about to go increasing my risk of food contamination.

Can you also guarantee with absolute certainty that you'll never forget them anywhere another person who's unaware of the contents or the danger could find them?