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.
That all goes into lawyers territory though so I'm out. I would assume as the seller they're liable, if they're just providing a shipping service for CheapChineseShitLtd then all bets are off.
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.