Russians themselves were willing (or were ordered instead of asked) to go die in WW2 against Nazi Germany. Was this a "sheer hatred of germans" that was due to "germanphobic propaganda"? Perhaps a bit, but there cleary was a worthy cause behind it all.
If it meant an end to the fascist regime of Russia, it'd be worth it. We all die anyway at some point, why not die for a good cause then.
Reagan was president 1981-1989. During years 1981-2023, there were only 5 years (1982, 1991, 2008, 2009, 2020) where US growth was less than 1%. I don't know enough to say whether that's thanks to or despite Reagan, but he sure didn't destroy the economy.