Pure democracy, with no criteria to establish suffrage except age and citizenship, is, of course, nonsense, though it is common. Unfortunately, the logical criteria: education
I disagree, the logical criterion to vote should be that you are a producer:
1. You are a legal citizen
2. You support yourself and all your kids and in no manner did your support come directly from the government. This includes all civil servants and state university employees. I would make an exception for military since although the government pays them, it also has control over them and enforces discipline, much unlike a SSI recipient.
The problem is that people are voting themselves money, stupidy is secondary.