We have explained to you succinctly why she stepped down, but apparently it's still not registering upstairs.
We don't know if she's going to run for President anyway, but even if she does, she has already accomplished more in 2.5 years than most Governors do in full terms. And Palin has 17 years of elective and appointed experience in office. If she was good enough to be picked for VP she's good enough for the top spot.
It's registering fine upstairs. What you seem to have a hard time understanding is that no child of a politician will be safe from tawdry display now that the left has won. This is going to hurt in the long run. She will be taken as an easier target and now has a reputation for quitting.