Thanks Mom.

Seriously, if paper napkins and no Dyson Aerosol-Your-Skin-Cells-9000 means I don't have to think about the sanitary habits of my fellow citizens, that would be reason enough to stop installing them.

They also scream like a banshee and don't dry your hands. I happen to also wear a beard, perhaps you can see why having only the Scream And Don't Dry My Hands Machine available would be unsatisfactory.

I don’t think it’s safe to assume that people are doing that good of a job on the wash step.

And even if they did, many (most?) bathrooms have doors that open inwards, so you have to touch the same bare metal that they (and every other previous user) also touched... and I'm yet to be convinced by the usual argument that it's for fire safety.