“To educate a man in mind and not in morals is to educate a menace to society.”

Term definitions here would greatly modify the meaning of the quote. By example: "educate" a broad umbrella covering spheres of expanded learning, indoctrination, brain washing, etc. "morals" — who's / what morals, that which is understood from eternal law or perceived from base / carnal aggrandizement? AND, society — a gathering of individual sovereigns, a socialistic heard of sheeple or some other grouping of forest vs trees?

This quote is uncoordinated in that education is synonymous with morals.  What President Roosevelt is referring is technology. Technologist are at this point in the 21st century, as in all of the written past, have typically been the instigators of social imbalance by introducing toys for the kids to make mess. For instance, Henry Ford making the automobile available for millions, folks like the Rockefellers fueling it,  was a total menace for social progress, as our above-mentioned President was probably not too aware because he and his other mentally disorganized supporters, also mentioned were not to psychologically associated with the real world, to busy being menaces.  Technology should be for the progress of humans, and not humans solely for the progress of technology, as presently practiced, sadly for the human. Wake up the robots.

Self-evident.