I’m not a fan on indiscriminate use of petroleum products but I really think people underestimate just how thin a single use bag is. Next time you finish a plastic bottle of milk or juice, weigh the container and see how many single use bags it takes to match that weight.
Single use plastic bags are a problem, but like plastic straws, they’re not even in the top 100 of culprits. People pick on them because they’re easy and because they’re symbolic.