Why is the wheel bearing grease leaking out of the dust cap?

I used to know a guy that lived in this:



One year, the wife and I drove to a car show, this guy drove his car. We stopped for gas and I noticed grease dripping from the wheel center caps.
It turns out this guy TORQUED his wheel bearings to ft lbs, not inch lbs. Yeah, the bearings were cranked in too tight and they overheated.
Who the heck torques wheel bearings ???