Well, if a guest gives off a dangerous vibe, the clerk can make judgement call.
If the person had a history at denying the keys at random for no good reason, people wouldn't trust them with the keys anymore.
Anyway, it's way more likely that they would call the home owner instead of just denying. People are mostly reasonable.
People recently voted Trump into office.
> with a feeling of no personal responsibility about our private affairs
I paid the money, give me the key. Plus at no point did I pay them any money -- they're just, essentially, key escrow.
It's good marketing for them since being in and out of a pizza place means someone will likely buy a slice, but as a BnB customer IDGAF what they think outside of giving me that bloody key.