Since gullible people tend to believe what they are told, other folks are more tempted to lie to them. So if one chooses to be gullible, one must accept a lot of responsibility for the lies one hears. Case in point: voters are greatly responsible for the lies their leaders tell them.

Yes. This is why our democracy is doomed.

It takes two, though: The person stupid enough to believe garbage, and the person spewing the garbage knowing they're stupid enough to consume it. See housing crisis.