Fuck prime and the paul brothers but you can't dismiss people/companies providing aid. By providing aid like this it frees up other resources for others to use. The professionals relay on any aid that they can get so long as it isn't going to hurt anyone. Someone allergic to something will know what they can/can't have.
Again fuck prime and it's a shit resource but when you're desperate you'll take what you can to stay alive.
Is bagging your own stuff really that much more work? The sacrifice is waiting in line for them to fuck up bagging it anyways. It's significantly faster to use self and get home sooner to relax. If you're over filling a cart I'm sure it makes sense to go to an actually cashier but outside of that it's just wasting time