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Perhaps so for Bitcoin because the government has an easier way to attack, yet if Bitcoin's coin taint anonymity is ever fix (see upthread the
interview with Adam Back) the 50+% attack comes back to prominence. And for the proposed altcoin, the 50+% attack needs to be analyzed because the government loses some (most or all?) of its ability to attack with regulation due to the strong anonymity.
You are likely correct that if an altcoin has stronger anonymity then perhaps governmental actors may want to consider a 50%+ attack. The solution is PoS. I'm not sure what you mean by "current proof-of-stake can't redistribute new coins to masses & I posit it isn't secure" The security aspect seems to be currently working ok for Nxt. The distribution issue is purely an economics problem and since any crypto is easily copied what's the problem with distribution?