Double clutching is not needing in a synchronized transmission. It is quite literally exactly what the synchros are there for. I guess you don't understand the purpose of double-clutching or synchros?
Not doing something that is not required to be done does not lead to broken parts. Abusing cars for no reason, otoh, does. Learn to drive better and your parts will last longer.
FocusFest 2013: Best of Show
Gateway FFW: Show Class Outstanding
September '13 ROTM