I think the best Mashul would be going into a store that sells both kosher and non kosher and ‘not’ buying the non kosher products and then being told :
“You have no self control so you need to have all stores that sell any non kosher products filtered out for you so that you never get to even enter the store.
If that means that you can’t eat because you live in a small town and there are no stores that are exclusively kosher, then you must stop eating”.