He explains that they wanted to stay in the Midbor was because their Avodas Hashem would be better there, but the Chidushei Horim explains that it is not their business to make a cheshbon like that.
Interesting. The Alter Rebbe asked the same question, and gave a slightly different answer (Likkutei Torah 37b – 38b)
?? ?????? ??? ???? ????? ??????? ????? ??? ??? ??? ????? ???? ????? ????? ???? ??’. ??? ????? ??”? ???? ??????? ??? ????’ ???? ?????’ ???’ ??? ?? ?? ??? ???? ????? ?????? ??? ??? ??? ?? ?? ??? ?????? ?”? ????? ???? ????? ???? ????’ ???? ????? ???’ ???. ?????? ????? ?????? ???? ????? ???? ????? ????? ?????? ?”? ??? ??”? ????? ???? ??’. ?????? ????? ?? ????? ?????? ?? ?? ??? ???? ?????’ ???? ???? ??? ???? ??? ????? ??????? ??’. ?????? ??? ?? ??? ???? ????? ?????? ??? ?????? ??? ????? ???? ???? ?????? ???’ ?????? ???? ???? ?? ??? ??? ??? ?????? ?????? ?????? ???? ???? ??”? ??????? ???? ??????? ????? ????? ??????’ ??”? ????? ??? ?????? ????? ?????? ?”? ??????? ??????? ???? ?? ??? ????? ??? ??? ???? ?????? ??? ?? ??????? ????? ????? ???? ???? ???? ????? ?????? ?”? ???”? ??”? ??”? ???? ???? ?? ??? ??”? ????? ??? ???’ ????? ???? ????? ??’
? ???? ?? ??”? ???? ?”? ???? ????? ??????? ??? ??? ????? ??”? ???? ????? ??? ????’ ??? ???? ?????? ??’ (??”? ??”? ??? ???? ?????? ?”?) ????? ??? ?????? ???? ????’ ???? ????? ???? ???’ ??’ ??????? ??? ?? ????? ??’ ???? ????? ?? ????? ????? ????? ?????? ???”? ???? ???’ ????? ??? ?”? ?????? ?????? ??’ ??? ?? ???? ????? ?? ?”? ????? ????? ???????? ??? ?????? ?????? ?????? ?? ?? ????? ?????? ?? ?? ????? ??????? ????? ?????? ???? ?????? ???? ?? ??????. ??”? ?? ???? ????? ?????? ????? ?? ????? ?????? ???? ??? ?????? ???????? ?????? ?????. ???”? ???? ?”? ????? ???’ ????? ??? ?”? ??’.
?? ???? ??? ?????? ?????? ??? ?????? ???? ???? ??????”? ??? ????? ????? ??? ????? ??”? ????? ??? ????? ???????? ??? ???? ??? ????? ?? ????? ?????? ?? ?????? ????? ?????? ?? ?????? ???????? ?????? ?? ????? ??’ ??? ???? ????? ????? ?? ?? ?? ?”? ???? ???? ??? ?????? ??’.
In short, the Alter Rebbe holds that the meraglim’s issue is that they didn’t want to make the ???? ????????.