איכה אשא לבדי טרחכם ומשאכם וריבכם
Rashi derives from the word masaachem, your burdens, that the people were apikorsim, heretics. They were skeptics who did not believe in their leaders. Thus, they questioned the motives of everything that Moshe Rabbeinu did. If he left his home early, they asserted that there was trouble at home. If he left late, they claimed that he was busy seeking ways to take advantage or hurt them. They were bogged down with suspicion. Nothing was good enough for them. They had jaundiced misgivings and perspective about everyone who helped them. This is a masa, burden. Apparently, Rashi feels that an…