How can DAO resist to PR campaigns and 51% attack

Lets talk about your opinions about how can a DAO resist to PR campaigns, social engineering, mass media engineering, populism, etc.

As I understood the whole point of DAO is to eliminate those PR methods that I mentioned, so an organization can improve and evolve autonomously without bad or engineered influence. But how can it resist to 51% attack on governance voting and stay on it true course of actions? When we look at all those FUD in crypto space which change rapidly, what would happen if that FUD gets injected purposely in governance voting by mass media for example?

In ideal situation , DAO is PR proof, but we are far from ideal situation, at least decades.