Menachem, being a talmid/chasid of anyone can make you unable to see their mistakes or chisronos, and that’s not necessarily a bad thing. There were people who were against my main rebbe, but I didn’t care and chose to judge him favorably, even in one case where it was challenging, and I’m forced to admit that he made a mistake.
As I’ve mentioned a few times, it doesn’t concern me if the Lubavitcher rebbe was a tzadik or not; what I’m concerned with are the issues at hand.
I will add though that rav Nachman of Breslov said that the velt makes two mistakes about tzadikim: one is that they can’t make mistakes, and the other is that if they have made a mistake, that shows that they were never a tzadik to begin with. When i acknowledge that my rebbe was capable of making a mistake, that in no way impacts my fidelity to him, his psakim or his teachings.
Why can’t a Lubavitcher accept that the Lubavitcher rebbe may have made mistakes?
Mistake doesn’t mean aveirah by the way. I’m well aware of the tanyas definition of a tzadik.