It's simplistic because "voting wrong" assumes that voters can vote right and ignores problems such as limited party systems (see the US, where a lot of people feel their only choice is between "bad" and "worse"), lobbying, limited information, media influence... Not to mention that even if you "vote right", other people might "vote wrong" and thus your efforts are void.
It also assumes that everything can be realistically changed by "voting", as if legislation wasn't a slow process that's error prone and subject to manipulation, and also sometimes limited. See climate change, for example. Shell knew about climate change in the 70s and kept that information hidden. How could someone in the 70s could have realistically voted against that?
And finally, it assumes that people can vote in the countries that are doing "the bad things". I don't live in the US so I had no way to vote against the US pulling out from the Paris agreement, even when that decision will affect me. Someone in a sweatshop can't vote in western countries to force companies to stop using forced labor overseas.
So yeah, dismissing the influence of the ultra-wealthy in how the world is run and what future is going to be left for us because "you could have voted right" is incredibly simplistic.
> They may influence who runs and donate money but even that is a matter of laws that were loosened or can be passed to fix them (e.g.:citizens vs united)
So wait, citizens can be blamed for "voting wrong" but billionaires can't be blamed for influencing who runs and with how much money? Specially when those politicians supported by billionaires will definitely stop by all means necessary those laws that would take away some of their power? That doesn't seem fair.