Well, Telegram is my main messenger and I don't associate myself with any of the mentioned groups. I think most of your impressions are bit bit over the top. That's not your fault as the media likes to paint Telegram in that light. Sure, there are these channels and yes Telegram tries to be light on censoring them, focusing only on the public and dangerous ones but still, claiming "Telegram is considered a platform for people, which do not respect the basic values of democracy" is a bit much as you could replace Telegram with the name of any social media/messenger platform.