Ah yes, let’s think we know better than everybody else.
It's also a tempting but dangerous idea to think that it's just a problem of "education". Not nearly as many issues are solvable by "education" as people think, IMO.
Actively attempting to trick people who aren't aware of something is totally different than assuming we know something better than someone else. Are you serious right now?
Inflation is inflation whether that is keeping the price the same and reducing the amount or increasing the price and keeping the same amount. Consumers are going to have to deal with one anyways so why fixate on the former?
Because the goal of shrinkflation is to mislead. You have the same packaging, but weight suddenly changes from 750g to 700g. Or instead of 24 eaches, you have 22. It's not prominently displayed on packaging that anything has changed. For many products you will notice a change in price more easily (and it's difficult to show changes in prices on packaging as it's the retailers who set those, and they change much more frequently)