I used to make problems between my parents when I was younger for what I felt were justifiable reasons...
That sounds like it could get a little problematical.
It felt right at the time and I'm glad I did things my way. If I'd just made them happy, I wouldn't be who I am today.
What you did was needlessly risky. You could have just as easily caused them to break up.
I'm not so sure I didn't cause their breakup.
It's not the place of a child to determine the course of their parents relationship. I don't know the circumstances: maybe you were right, maybe not. If they were having problems, they should've gotten into counseling -- without your interference.