If Joe doesn't have time or staff to make sure his only means of generating income is not offensive or hostile to his customers, he doesn't have time or staff to run a business.

Imagine if a store said they didn't have enough staff to QA the products they sell, so they shouldn't be blamed for injuries related to their crappy products. It's 2017, you can't say you didn't known lawn darts were dangerous and you really shouldn't admit you didn't know your store was even selling lawn darts.