You know those carts rarely get cleaned, much less sanitized. Think about it. Have YOU ever seen an employee bleaching those bad boys? Everyone knows that diarrhea spreads bacteria that makes you sick - I've even seen signs near lakes and swimming pools prohibiting you from even entering the water if you've had it (which I'm sure people ignore) within the past 72 hours. Just because you can't SEE it doesn't mean it isn't there. THIS is how you and your kids get sick and end up with (sorry for the grossness but...) it coming out both ends . Terrible.
I've had people roll their eyes at me when I stop to clean my cart. I've had people look at me like I'm dumb when I say I will just let my kid walk because I don't have my cart cover with me, rather than stick him in a naked cart. Even my husband sometimes acts like I'm overreacting when I gripe at the boy to not pull it off the handle or to not touch the bare cart. I don't even like to set my purse on those seats if they're bare, and this is why.
PEOPLE ARE NASTY, YO.
This is the reality. These nasty people EXIST. These people don't wash their hands after going to the bathroom, or they just sorta run their hands under the faucet for a few seconds (it's 20 seconds of lathering MINIMUM folks!) so they may as well not wash their hands at all. They cough and sneeze into their hands, congratulating themselves on being so great at stopping the germs from spraying all over, then proceed to touch every chair, doorknob, and soda fountain in sight. They rub their noses before grabbing the salad tongs at a buffet. They think their kid pooping on stuff that other people have to use too is funny.
I will NEVER let someone make me feel bad for being germaphobic in certain situations. If you're ever with me and you think I'm being over the top, I'd like you to remember the above photo (from STFU Parents, may I never be enough of a clueless turd to end up there) and know that I'm NOT crazy, and I have reason.
(PS - this is also an excellent argument as to why it's so gross to put your purse on the kitchen counter or dining table. Think of where that thing has been.)