How does this Pasuk fit into Moshe's rebuke of Yisrael?
Rashi: From the fact that they readily agreed with Moshe's suggestion and did not reply that it is preferable to learn from the Rebbe - Moshe 1 , than from the Talmidim, Moshe understood that they liked the idea of more judges, 2 who would be easier to bribe than himself.
Rashi: Who had initially toiled over the Torah. R' C.Z. Fogel: We read "Eichah Esa Levadi?" (in Pasuk 12) with the tune of Eichah, since this was the root of the Churban; they did not esteem Torah enough to prefer learning from one who toiled for it. This is like the Ran (Nedarim 81a, citing R. Yonah), that the Churban came because they did not esteem Torah enough to recite a B'rachah over it.
See Oznayim la'Torah, who explains the unusual Lashon "va'Ta'anu osi" according to this explanatin.
Why did Moshe add the otherwise superfluous) word "Tov ha?Davar asher Dibarta La'asos"?
Rashi: With reference to Yisrael pushing him to get on with it, whenever they felt that he was lax with regard to appointment of the judges.
