The moon landing was real, not a hoax. Either way, the soviets built socialism, but not in its "final form," such a notion is silly and draws on Khrushchev's farcical claims that class struggle was over in the USSR. Socialism was built in the USSR, Cuba, the DPRK, China, Vietnam, Laos, etc. China is achieving its goals, steadily. It is not simply a sacrifice, each day it is continuing along the socialist road.
You have a very metaphysical idea of socialism that goes against dialectics, and thus also allows idealism to bleed in.