I think mistakes will continue to happen because we don't live in a perfect world. All anyone can do is learn from their mistakes so they may apply that experience later down the road. The best reasons I can personally give for the use of 2.4 is I have lost 2 airplanes due to a transmitter being turned on in the pits on my frequency while I was flying, the last one was one of my 3.3 Comp Arf Yaks and that one stung just a little. I was also witness to a transmitter that was left turned on in the impound at the IMAA event in WACO TX. in 2007 that I was attending. This accident caused a crash right after takeoff of that unfortunate pilots airplane. So for at least me, 2.4 is a cheap insurance policy and I would not even consider flying any of my birds with on 72 or 75 anymore.

Bob