You're taking the wrong approach. You're starting with some kind of goal in mind and then deciding how to reach that goal through various actions. Instead, you need to decide what kind of actions are permissible and then figure out what goals are compatible with those actions. As you mentioned, murder is right out but so should all forms of assault on person or property, including theft, which is what taxation is.
I'm starting with a goal, attempting to find actions that will make progress towards it
and discounting any actions that I find immoral. There are some countries with dictatorships causing a strong active restriction of the liberties of the people who live their. An action that could increase the liberty of those people is to go to war with those countries and overthrow their government then help the people to create a society that is more free and more democratic. I believe this is wrong even if the outcome is a long term improvement because I believe that war is
always wrong.