I'd believe you were sincere if I saw the same kind of posts when elections weren't right around the corner.
Anyway the answer is that you can talk about it responsibly, but you have to look at the end result or consequences for each of the choices available to help determine the way forward. You can't frame it as whether the party meets a particular threshold of goodness before it's worthy of your vote. While there is a lot of low hanging fruit, not everyone will agree about everything and people are naturally resistant to change. It takes sustained effort.
It's the responsibility of everyone in a democracy to participate so that parties are more representative of their constituents. Only a tiny piece of that participation involves voting.