KenV,
You are right, and there are even more scenarios I could offer where a passenger, perhaps with the best of intentions, may get it wrong. These things are rather more complicated than the average person may realise.
Please leave it to the professionals who will have discussed these issues endlessly and who will have practised how to assess the situation, to open the doors and to activate the slides.
Yes - of course the professional crew may get it wrong - but the untrained passenger is far, far more likely to make a major mistake and kill people.