Earlier quoted context omitted.
I think many Russian people, especially those who watch or read mainly Russian news, hold such views with complete sincerity. The internal propaganda is quite effective.
Anecdotally, my inlaws who are NOT Russian also hold pro-Putin and pro-Lukashenko views. I avoid politics with them. Why? Because they mostly watch Russian TV (those Russian WW2 serials are addicting). The propaganda in the Russian TV talk shows and news is very well done. It is just like any other echo chamber. Just like watching Fox News,listening to Limbaugh in US, etc. There are echo chambers for all political sp…
Avoiding some topics in fear of insulting/upsetting other party, or in context of social media in fear of downvotes/flags, is the main cause of these modern echo-chambers.