Unions are member led though. Therefore the campaigns come from motions put forward by members that have enough representatives voting for it because they have to vote for what their own members have told them they want.
If you are a member of a union, your voice and opinion is as important as another member's. You can talk to the elected (by members) Executive Team and ask them to take your opinion forward as a motion and, if enough members agree with you, it's carried.
If you feel your union doesn't represent your views then you need to step up and become active. Get involved with Union meetings, consider becoming a rep or an even an officer yourself if you feel really passionate. Make sure your own branch executives know what you want so they can take it forward for a democratic vote.
Change comes from people acting. Be the change you want to see.