RT is a mouthpiece of the Russian government; the only "other side of the story" that would come from it would not only be misleading, but also promote the authoritarianism, war crimes, and aggression of the Russian government.
In an age when LLMs make reading the truth harder and harder, blacklisting publications that are guaranteed propaganda is essential.
In the same vein, even though I'm fully supportive of Ukraine and its right to self-defense, I don't think people should use any of the equivalent American propaganda agencies (U.S. Agency for Global Media: Voice of America, Radio Free Europe, Radio Free Asia, Middle East Broadcasting Networks, and Office of Cuba Broadcasting), since their reporting is often deliberately biased in favor of American foreign policy interests. Furthermore, there's plenty of Western media sources not backed by state interests, so they're never the only source on something anyhow.
The only reliable public broadcasting organizations are those with independent operations financed via public contributions, such as the BBC.
Private broadcasting organizations often have bias as well, with tabloids and extremist sources such as Newsmax being just as unreliable and misleading as state-backed outlets, so vigilance in maintaining a line in the sand between journalism and propaganda is essential.