I live in Israel.
I do not wish to be recruited to the Israeli army for two main reasons. One is the preservation of my liberty (the mandatory service in the IDF is 3 years), the second is the desire to refrain from harming others.
While I am not sure how to justify this principles in a general theory of "the universe", I am firmly certain that in Israel, the political situation enables me to use them in order to avoid being recruited to the IDF.
However, there is a third variable that keeps nagging me - justice. If I do not serve, other people are protecting me, and there is nothing I can do to avoid it. Can you help? Suggest a line of reasoning and investigation?
I am not so sure that you can get out of your military service simply by saying that you wish to preserve your liberty and don't wish to harm other people. You may know the present situation better than I do, but I know of a number of young Israelis who ended up in jail for refusing to serve in the IDF. I see your justice point: The IDF is protecting the physical security of Israeli citizens (or at least of a large majority of the Israeli population to which you belong), and so it seems unjust for you to enjoy this protection but then also to refuse to contribute to it. You say that there is nothing you can do to avoid being protected by the IDF. If this were true, then this would weaken your reasons to serve. To illustrate, suppose you have a fan who, unprompted by you, greatly improves your reputation by posting admiring stories about you on Facebook, by very effectively singing your praises to important people in your social environment whose support will greatly help your career, etc....