If you want to achieve something that you think sideloading is the only answer for then maybe try and find another solution? Btw. I’m not arguing we shouldn’t educate people about the dangers of phishing etc etc. just that engineers should find better solutions than shortcuts.
Some people will never understand the need to be vigilant. And even vigilant people have momentary lapses of vigilance.
[edit] i think we’re talking about deliberate sideloading but also accidental sideloading in the same breath here. One enables the other? Accidental sideloading is very much undesirable.