You're absolutely right, some things are unquestionably greater than code!
I think most developers, if asked, do in fact care about security, privacy, standards, net neutrality, and open source software. The issue, I have found in my many conversations with developers, is not that developers do not care about the items you have listed. Most do! That the EFF and the FSF and similar groups continue to exist shows this.
The issue I see at hand is that unions need to look like a good deal for people to sign up. People need to expect to gain more for their dues and participation than they could gain on their own. If a union is going to send money to the EFF, and I can send money to the EFF myself without the administrative overhead of a union, what does the union gain me?
Think of it in business terms, as successful unionizers have always done. What unique value does your new model union offer that justifies the costs? You're asking people to make a major financial commitment to group together and advocate for themselves, but you're focusing almost exclusively on secondary issues.
It is not that a union could or could not do all the things you suggest. The issue I see is that a compelling case has not been made that a new model union is the best way to advance the causes we care about. Where's the return on investment in collective bargaining for us?
Also: I see that you created an account solely to have this conversation. Have you come to understand why developers don't unionize, or did you expect to convincingly advocate for unions of software engineering professionals?