How can you grant someone the right to do something that you don't have the right to do yourself?
You are surrendering some of your rights to an abstract entity called democratic government , and you are only surrendering them under the condition that every other person living under this governments also surrenders their rights.
You can't surrender a right you don't have either.
Here's the flaw in your argument: If people can not be trusted to govern themselves, then how can they be trusted to choose good governors?
If people can not be trusted to build airplanes that won't fall out of the sky, then how can they be trusted to choose good airplane manufacturers?
And should I let you select which airplane manufacturer I fly on? Would you let me pick yours?