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There could be millions of reasons why they elected not to deice. Maybe the crew was "timing out" on their duty day limitations. Some Flight ops manuals used to cover "Frost on wing surfaces" as acceptable if it does not stick to the surface of the wing.( This is before the Feds put out the Clean Wing Concept. Maybe one of the crewmembers did the old " Amex deice" proceedure, where you take any credit card and scrape off any frost on all leading edges. Some Charter operators have a provision for one of the crew members to visually inspect the wings from inside the cabin prior to departure, as a last minute "good to go" check.
I can assure all that the Buisness Aviation community is very shocked and saddend at this tradgedy for the Ebersol family , but also the G-3 crew that perished in Houston.