No, I'm not talking about abortion. I am talking about forcing your political opinions on others. For example, most people on the Left want to ban guns on school grounds, while most on the Right want to allow them. Why not let the parents at each school decide? Is uniformity a such a virtue in itself?
Red & title question:
How droll of you to have posed the question as you did. With that understood between us, I will answer. I am pro-choice until my "side" earns or is given the authority to make decisions. Prior to that point, I'm fine with hearing all cogent arguments for one course of action or another. If my side wins, I'm not at all pro-choice. If my side loses, I don't expect the prevailing side to give me a choice. So once I have the authority, will and ability to act, hell no, I'm not pro-choice.
Quite frankly, I think it naive to think that any other person who gives a damn about "things" is pro-choice. What is the point of having a position on matters that have impact on more than oneself and one's immediate friends and family if one, upon being given a position to effect action, abdicates one's responsibility to take action for what one believes is for the good of the whole, even if the "losing side" of that whole doesn't necessarily think so?
Sure, leaders need to take input from wise advisors, but at some point, a leader must say, "Okay. Enough. I've heard you, and I've made my decision. We're going to do X." Does that mean that leaders will sometimes force their decisions on others? Of course it does. The leader's choice will either be effective or it won't. Either way, progress is made, be it the direct sort resulting from the decision made, or the indirect sort that results in having learned from a mistake.
Blue:
As goes the specific example you mentioned, to the extent any school still has (or used to have) no on-campus firearms carry proscriptions, isn't that what existed anyway? I don't recall my school (a boarding school) having any prohibition related to guns on campus. It may have, but having a personal firearm on campus was so distant from anything I wanted to have, that if it did, I never even noticed.
Be that as it may, the reason for not letting individual parents decide for themselves,campus non-security employees, and their children is because school security falls within the purview and skillset of security personnel, not teachers, not administrators and certainly not children. I believe the last thing we need is untrained and unskilled folks routinely "packing heat" on school campuses. If that means we need to establish airport-like security for school grounds, fine.
If I were the person in-charge of ensuring school safety -- be it at the school level, county level, state level, etc. -- might it be that I'd impose "something" (sitting here, I can't say what exactly) to make sure that if kids/teachers get shot, the gun that fires the bullets isn't inside the building. Would some folks feel put off and feel my solution was forced down their throat? They sure will. And you know what? Their kids will be alive and unharmed so they can go home and listen to them complain about how I usurped their rights and freedoms. I can live with that.