As someone who wanted to join the military in my youth before coming to secular Buddhism, I understand where you're coming from. Terrorists and thugs won't stop until the consequences of violence (their negative karma) are immediately understood, hence the need for shooters like you.

There is a term in the US military called 'sineater', someone who incurs the unfortunately necessary sins and takes them on others behalf. It is good you recognize your actions as negative and have remorse. You seem smart enough to realize the path out of the suffering of remorse is to stop killing, so I won't preach that.

I almost killed a kid in a street fight, and that really made me question the lines of thinking that got me interested in the military: protecting my nation which included my loved ones, getting paid to exercise, train, and fight, and witnessing suffering. But as I saw the kid clutching his throat on the ground, I felt the mercy of emptiness. I saw a golden web connecting us and his community. There was nothing separating us, and no need to fight. That has formed my current perspective on why, if ever, to fight.

To answer your question about being robbed, I'd try to get the drop on the robber, ask him why we're even doing this, and flash my strobe. Ideally he runs. If he attacks, I'd stop him so he couldn't harm anyone. Not out of self protection, but so he didn't generate the negative karma, nor impact my family's life. The assailant deserves the chance of liberation too. Obviously an ideal scenario, I hope it never has to play out.

Ignore the dogmatic judgement. Politics are so tied to intuitive morals, which we are all working on defusing. A more practice oriented sub without the dogma is r/streamentry.

Godspeed toward liberation, sineater. Someday you will be able to grow into a different lifestyle. There is always redemption if you choose. Good luck on your journey.