Answer :
I do believe it is a wise answer because if he let them know about the whole plan then the crew may have backed out. Because he didn't, the crew went along with it with no problem because they didn't know what was in store.
Odysseus has already lost several men before landing in Circe's island, therefore these men have already been discouraged, demoralized, etc. For Odysseus to reveal more challenges to these men, would mean an additional amount of demoralization for them. This could lead to the crew leaving Odysseus behind. Therefore, I think it was wise for Odysseus not to tell them about the dangers.
