Maduro is not popular. Go find the nearest Venezuelan and ask them what they think about the situation if you want to learn more.
It you have an opinion, just say it. You don't have to pretend like you care about what other people are saying or what facts or evidence they have.
You can just be honest from the start that you don't agree with them and don't care what they have to say or show.
Clinton won the popular vote by 2% and she was on average 3-4% ahead in the polls..
In fact she she got more votes than predicted in early November since 3rd party candidates significantly underperformed relative to what they were polling.
It seems the only evidence you would accept is written testimony signed by Maduro himself. I don't think it's a reasonable standard though.
If we accepted your standards we would be helping dictators stay in power. This is not reasonable way of thinking imo.