Achdus, to which Chabad are you referring. Chabad is a chassidut without a rebbe. This is like being a ship without a captain. Anyone can claim to be a Chabadnik and speak for the entire group. This is also the problem with Breslov.
Noshoichis, Mizrahi also disagrees with the Gemara. He says that non-observant soldiers who die for Israel go to Gehinnom (Baba Batra 10a and see הרוגי מלכות on Toraland).