guys, i believe the guys that fold preflop might be grinders who play 12-24 tables and might not notice what is going on at their table. when you play 24 tables you get to act about once every 2 seconds or less, so you might not get the chance to know what's going on, you might get suspicious if you are in late position, but lets say you are UTG plus 1, UTG shoves and you have 57o, you instant fold because there are another 5-6 tables blinking in the back ground.
plus if you are a big time grinder, even a rakeback slut you will have your chat turned off so you won't see what people are talking about.
plus there are the people who play 1 table at the time, while watching a movie, table blinks, 3 ppl all in before you, fold instantly.
plus there are the people who simply do not speak english. there can be a very new player who doesn't even understand what FPPs stand for
i believe that those who fold have either no idea whats going on or they are not paying attention.