If the specialist cannot explain to the common population in a concise way the implications of carrying out a project of that size so that they can make a sensible choice in a vote,

There’s no concise way to explain something complicated to a layperson that doesn’t end with “trust me, I’m the expert”.

then the problem lies with the specialist, not the population. Giving that kind of explanation is education.

Shifting the blame doesn’t make the problem disappear. Whether the population is uneducated because of a lack of qualified specialists, or simply due to being incapable of understanding the information, the outcome is the same. You still have uninformed people making decisions.