Why does it say "va'Yitav ha'Davar"?
Malbim: Bnei Yisrael did not come amidst hatred or jealousy, rather, amidst love, to prevent them from sinning. Therefore they were happy when they found that there is no sin. Had they come amidst hatred, they would not be happy upon finding no reason to fight!
What is the meaning of "va'Yvarchu Elokim"?
Rashi: They thanked Hashem.
Why does it say "v'Lo Amru
Malbim: Also from the beginning, they did not want to ruin [Ever ha'Yarden], just to prevent them from sinning.