the universe looks for balance in all things; keep in mind, what we consider justice can sometimes be worse than the offense we're having issues with. Everything works out in the end. You cannot give without receiving; you cannot receive without giving back.
Yes, plenty of times, some people get executed in the world just because they are with the wrong people.
I can't think how there can be an excess of justice. Like there can't be an excess of love and kindness. If these things somehow have a negative impact on someone then they were not given in their purest forms..imo of course