While it is probably accurate it is a broad generalization, there are many different flavors of UAV's and we don't operate them like manned aircraft. If you look at the numbers most of the UAV's we fly are pretty
small and
cheap, it would take 100 of them to equal the price of an F/A-18. So what if we crash a few, the return on the investment is pretty damn good.
There are not as many of the bigger UAVs, like Predators and Global Hawks, that cost $10-50 million. While they may have a higher mishap rate than several manned aircraft they were deployed as developmental systems and are often operated in ways that we would not operate a manned aircraft, often with higher risks. The USAF was sometimes quite cavalier in operating Predators when they first started flying them, treating them as disposable assets. After they realized they weren't they haven't crashed as many, though they occasionally used a few as sacraficial lambs. Even if their mishap rate is still higher than manned aircraft (I am pretty certain it is, but pretty decent for the bigger ones) they provide us with some capabilities that manned aircraft don't have at a much better cost, and give the troops on the ground a much better chance at winning the fight. I don't see how that is a bad thing at all.