>But many locales don’t allow that

Sounds like you should be looking to change that before making private parties take up that burden and risk.

Property rights don't change just because it's a larger company everyone (including me) hates.

Also, like it or not, if even once, a person from this camp causes an incident with a customer in the parking lot, or even just with someone else at the camp, Wal Mart is at legal risk. Fuck even if the company somehow changes its entire corporate tune and decided out of the charity of their hearts to embrace the plight of the homeless, it doesn't stop someone who gets into an issue, even of their own stupidity, from making a case in court that Wal Mart knew and allowed a "hazard" to customers to develop on their property.

Edit: lol I "understand the point" just fine. I'm just actually equipped to function in the real world and don't just live in a fantasy I've crafted in my head like you.