Amen. There's always that first time where you're able to trick them but then they know and start to realize you sometimes trick them. For us that meant this obnoxious gap between being smart enough to avoid deception and smart enough to appreciate the higher level importance of something like nutrition. I don't know if my oldest ate anything green between the ages of 3 and 6.
I don’t have kids but I worked with them quiet a bit.
Their lack and experience and general credulity and trust toward adults allow to manipulate them more easily than adults in my book. But you still have to work for it of course