They batch test, they sub-contract testing, they only buy/supply from vendors that have already tested their products. There's tonnes of ways to avoid selling dangerous shit to consumers.
Sure, but not in a way that's not going to affect their bottom line and that's going to be a huge part of their process decisions if they can wiggle away from legal liability.
I wonder how they can sort that out? Not sure it's possible to test all 606,000,000 items that they distribute...