I blame it on the EULA
Corporation have so bombarded users with EULA's that I would wager that 99.9% of all people that have used a PC-based computer running a Windows OS have been conditioned to just click any and all "OK" messages whenever they see one without ever reading the details.
That's probably what happened here. You can't really blame the guy..
(I resisted using the much-too-obvious nuke icon)