Okay, so the expression is: "Democracy is the theory that the common people know what they want, and deserve to get it good and hard."
That is an overgeneralization - and so, false -, granting "the common people" is precise enough to be used in the context in which he used it. Sometimes, some of those people deserve to get what they want. Sometimes they do not. For example, if most of those people want slavery to be allowed, or want Black people not to be allowed to vote, or to marry, or want to ban interracial marriage and only allow same-race marriage, they don't deserve to get what they want.
So, if democracy is what Mencken says in that quote, it's a false theory.
With regard to your question to Loren: "Is it time to call off democracy?"
I'm not sure how you call off a theory. But it's time to call it a false theory (well, if that's what democracy is, and one is inclined to make assessments on the matter and state them), or call Mencken on it, or (I've not read his work) reckon that perhaps taking the quote alone leaves aside relevant context, so he did not mean that, and does not support your position on the matter. In any case, that does not seem to support your view.
dismal said:
But what I mean is who decides what qualities a judge should have? Loren, the elite here at TFT, or a majority the voters?
The basic premise of Democracy is that it's a majority of the voters.
When you say "what qualities a judge should have?" are you using "should" in a moral sense?
If it's a moral sense, the use of passive voice makes it a bit ambiguous, but in any case, it's clear that the majority's view does not make a judge morally good or bad, just or unjust, etc., so if that's a basic premise of democracy (or capitalized "Democracy"), then Democracy is false - or else, you are mistaken and that is not a premise of Democracy.
If that's not a moral sense of "should", what do you mean?
Maybe that a majority of voters decides what conditions a person needs to have in order to be a judge?
In any case, the part about who "decides" is also problematic.
If you're saying that a basic premise of the theory "Democracy" is that in some place (where?) a majority of voters decides what conditions a person needs to have in order to be a judge, then the US is not one of such places. In the case of SC justices, the conditions are established in the Constitution, and a majority of voters may not constitutionally change that - nor can they in practice do that.
In the case of, say, lower federal courts, the decision is made by Congress, but that's not the same as a majority of voters. For example, the Senate is elected at a state level, and party X can have most Senators even if party Y has more votes. The same goes even for the House. Moreover, even if the composition of Congress reflected the majority of votes, they may well make choices the majority of people do not agree with.
If you're saying that a basic premise of Democracy is that it is just that most voters get to decide like that, then Democracy is false. It may be just sometimes in the sense it produces just results, and unjust some other times.
Maybe most voters want judges to be only Muslim males. Or Christian White males. Or whatever. But said choices in no way guarantee or make it likely that the judges will all or most be just.
If you didn't mean any of that, I would ask for clarification of the premise in question.