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Yes, but people regularly get burns and light blunt trauma from airbags. The US versions of many cars even have slightly weaker airbags, because many people don't wear seatbelts and might be killed by a full-strength airbag.

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You've actually got it backward. FVMSS regulations in the US require airbags that are more forceful than the UNECE regulations in place in Europe (and other countries which follow Europe instead of the US). You're correct it is about seatbelt use, though. No seatbelt requires a faster airbag to restrain the occupant.

In modern cars the airbag will not fire if the seatbelt is not used. This is the reason why we even have seat belt detectors that make this annoying noise - not just to annoy you but also to figure out whether its safe to fire airbag or not.

Getting hit with airbag into the face when wearing eye glasses for example... that would suck, would it not?

This is just false. Look up a crash test video. You very much do hit the airbag despite the seatbelt.

This is completely untrue. The airbag will fire regardless of whether the seatbelt is worn, though it will be much less effective at restraining you. Out of curiosity, where on earth did you get the idea that they don’t fire?

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