We do not encourage tagging users with such reasons. As much as possible, people must only tag others with legitimate claim and supporting evidence that must be referenced on the flag. Also, once a user tag others unreasonably, it would also be shown on that user's sent feedback -- in which if was pure non-sense feedback, would then just soon backfire onto that user. And on a stronger point, tags with those unnecessary reasons often tend to not be taken into consideration for campaign restrictions and/or by campaign managers. Lastly, some people never tend to investigate nor do their own research first before investing on projects. Instead, they read whitepaper, see if it has potential just by their own reasoning, then invest right after.
Highlighted the text that they don't understand how it works. And yes, it is not really the fault nor the shortcomings of the community once a user had been scammed in his investments. You already mentioned it, they don't understand. Hence, some users tend to be attracted with a good project idea and sees it as an opportunity for an easy money, plus the fake reviews that adds to his hopes up and FOMOing the user. Right now, all the users that were active in scam busting is passionate in taking down scam projects ASAP, and it would be the investor's initiative if he will investigate and research first or not.
Hope this clears out your questions.