Picture worth 1000 words
That's clearly an apostate trying to make the Witnesses look bad.
In fact I dare someone to dress like a homeless person and sit down next to the cart with this sign:
"Luke 18:22 Sell everything you have and give to the poor, and you will have treasure in heaven."
The OP who posted it on Facebook confirmed that it's not a photoshopped pic. He took the pic.