The people in "The Democratic People's Republic of Korea living in a self-reliant socialist state with elections" should blame their necrocracy, their dear leader and his cronies for their plight. They should not blame democracy, the republican party or the people.
The difference with Venezuela is that Venezuela not only described itself as socialist, but was described as socialist by socialists in other countries; when it was still rich from the oil - I guess you missed the pamphlets roughly stating that "Another world is possible: Venezuela". Democratic countries didn't praise N. Korea for their democracy before the latest famine.
Additionally the policies in Venezuela are consistent with the socialist idea as previously explained; seizing control of the means of production is one of the main parts of socialism - it is just that it invariable fails in practice (taking from the rich is easy - and giving some to the poor; it's just that everyone always take a bit for themselves as well); and also that it removes the incentives for efficient work - which caused the collapse of Venezuela when the oil stopped flowing. So, the problem in Venezuela stems both from the inevitable failures of implementing socialist ideas in practice - and additionally from the inherent failures of the socialist ideas (removing incentives to improve).
Sending families to work-camps for speaking their mind in N. Korea is inconsistent with democracy.
Those are simple facts.