I understand the feeling behind your thread. It's not always easy to find common ground with other players.
The reality is that Open Crew isn't there so you can find people wanting to do what you want or follow your orders. That's not the aim of the feature. Captaincy isn't meant to give more power to one player over the other either.
Sure trolls are a pain in the butt, that's a given. But would you like to use the feature if you weren't the captain in this scenario ? Not being able to have a say in what the next voyage should be ? Being at the risk of being kicked out in an instant if your captain wishes to ?
When implementing a power dynamic, you should always ask yourself if you'd like to always be at the short end of the stick.