Why would a higher turnup in elections result in a better democracy?

I’ve always been told that the government tries to make as many people vote as possible so the democracy would function better (which was also the reason behind obligatory voting).

However, so many of the people voting don’t really think their decisions through, or base their opinions of really stupid rumors (I’ve heard some very idiotic ones on TV in an item about the US elections).

Call me elitist, but more people voting isn’t by definition better when people don’t know what’s good for them, right?