I one heard something said in the name of the Chofetz Chaim.
There was once a doctor that came to a town for a while. Local theives stole the doctors equiptment and meds. The next day someones child was severly sick, the parents came running to the doc, however the doc was unable to treat the patient since he had no medicatio.
The moral is, by bashing Gedolim we are accomplishing one thing, that in the event that we will have to use them, they won’t be able to help us. Our children or spouses won’t listen or respect their words. Same as with the doctor.