Because Putin, Zelensky and Biden are all bat shit crazy mass murderers. As the famous saying goes "You may not be interested in war, but war is interested in you". And If you ignore the real world for long enough, you might end up being part of the "mass". 

I too don't care about Stalin's philosophy but I'll use his quote:
- "The press must grow day in and day out - it is our Party's sharpest and most powerful weapon."

If you want to be immune to propaganda, you have to know the source material and all points of view.