Old Painless, eating bugs raw is a last resort. But if you're already that far gone, you probably don't have shelter or water and those are likely to kill you first.
Ron and Karen demonstrate it (and partly it's for gross-out factor i.e. they have a great sense of humor), but demonstrating it when you have resources near you and backing you up, when you are NOT in a real survival situation, is different than the real thing. The real thing may be a situation with no back-up.
Marty Simon teaches plant I.D. and use for food and medicine. He is so adept at doing it (and teaching it) that he rarely needs to kill anything to survive. You really only need very little amino acids to live. It's a more labor-intensive process to learn to identify them, but it's by far the smarter choice.
It also burns less calories than hunting and building traps.
Now, that said, it doesn't mean anything but this: if you are at last resort, and you are injured, it's much easier to pick the leaves of a plant and eat them raw (and much more safe) than to catch many kinds of bugs. However, it also means a much less calorie-consuming existence in the wild, so the calories in/calories out ratio is relative.
Here's a link to Marty's plant I.D. course:
http://www.weteachu.com/course_list.htm
And the text from it:
WILD PLANTS INTENSIVE. We added this new course several years ago and it has become a very popular program. This course is devoted just to the study of wild plants. We will spend the entire week learning to identify over 90 edible and medicinal plants. Not only will you get to see these plants, but you will also learn how to gather, harvest, and prepare them. You'll even get to eat some delicious wild plants. We usually prepare one whole meal with what we have gathered. You'll learn how to make all kinds of healing salves, cough syrups, mixtures, essences, soaps, and tinctures from over 35 common medicinal plants. You'll also learn how to make flour, cordage and natural dyes. All materials we use during the course are natural and do not contain any petroleum products. Everything you make will be yours to take home. This course will be held at our base camp, but there will be many side trips taken to special areas. There is no prerequisite for this course. As with all of our courses, each night we will have a great campfire with interesting and informative group discussions.