Why is Eastern Europe so socially conservative?

Whenever I see opinion poll maps on :reddit-logo: from Europe with questions like

• Would you be ok with your son/daughter dating a person of a different race?

• Would you be comfortable with your son/daughter dating a member of the same sex?

• My country has too many immigrants, yes or no?

There is always a very noticeable difference between Western and Eastern Europe, with the West (and Scandanavia) being WAY more progressive, and Eastern European / former Soviet states being exceedingly conservative, particularly countries like Czech.

Why is this?

Maybe I'm just naive but I would think that the legacy of the USSR would cause the exact opposite tendency.

I also have no real context as I have never stepped foot in The Old World.