There is absolutely nothing wrong with grass providing you have surveyed it prior to use to determine its suitability, we are talking training here, not when you've had a failure and few options. All our training was to grass and never had an issue in my seven years of military service, as said previously we used to even run on at 35 knots, no problem, because the surface was maintained. Fixed wing come to grief when landing on surfaces not suitable as well, even when they think it is - runway under repair, did you get the notam.
Gordy, the grass in your #1 and #2 photos would not have passed muster here as suitable for training, don't blame the grass, blame the standards of which you are willing to accept as suitable. Our system ensured a surface flat as a billiard table and the grass kept mown short.