If people vote against their own interests, it is solely their fault, there is no way around it, deal with the consequences and do better next time. Saying that people must be protected against themselves means that you believe that your fellow human beings are inherently inferior to you and that they are not rational beings, akin to animals.
If you believe that you have intellectual superiority but you are not able to communicate that to your fellow countrymen, then you have failed thoroughly at being a politician, or you are not as superior as you think you are.