Again, you are conflating the redifos with the difference of opinion. They are not the same.
What exactly does the word 'they' mean? The ones that put them in jail? Reb Chaim Volozhiner who wrote the text explaining the shita of Hisnagdus?
Nobody cast any aspersions on the Ba'al Hatanya. The idea that he was not alone, and he needed others to protect his legacy from being tarnished, is not reason to be angered. Nobody exists alone, the Gra also cannot last without a Peri Megadim, Mesilas Yeshorim, Maharsha, or other Poskim, Sifrei Mussar, or Hanhagas Haklal.
Nobody exists alone, all of us need each other. That is not 'hateful' or 'casting aspersions'.
And your 'some will say' is poppycock. Nobody serious says anything bad about the Ba'al Hatanya, and if you don't know that, you are really living under a rock.