Other capitalist countries managed to improve the well being of the people because of wars and financial imperialism.
Holodomor had a lot of reasons, collectivisation was not the main one.
It is not right. The same "collectivisation" was tried in different countries like GDR (1953 uprising), and China, great Famine, 1959. So same strategy led to same results in different countries.
Collectivization initially leads to decrease and then to increase. In USSR result got so bad due to collection of reasons, unrelated to collectivization. Collectivization was badly needed in USSR, since 95% of population were inefficient farmers. It was a must for later industrialization.