While I don’t make the claim that I am a parenting expert, I did raise 3 children to adulthood. Most of it was done as a single father, since my wife left us when they were all still in grade school.
My rules were simple. Their room was their room, not mine. They could decorate it however they wanted, hang whatever they wanted to on the walls, whatever. I would not snoop, spy or interfere in any way as long as the room was kept reasonably neat, (bed made, no dirty clothes on the floor, vacuumed every now and then) and as long as there weren’t any other major problems (behavioral, grades in school falling, refusal to do chores, ignoring curfew, etc.)
That being said, I believe that, as a parent, I have a duty to my children. Kids are young, inexperienced with life, impulsive, and generally don’t have the ability to realize that they might be headed down the wrong road. It is my responsibility, as a father, to do everything that I can to keep them on the right road. That means that if (and only if) I suspect something is going on, then you can bet your ass that I am going to snoop, spy, search their room, or do whatever else that is in my power to find out what’s going on, so that I can address the problem. I love my kids, and would lay my life on the line for them. I want them to succeed in everything that they do. I want them to be happy, and well adjusted to life. That is my main goal in life. If I had given my kids an “exclusive right to privacy,” I would have been neglecting my duties as a father.
All 3 of my children were, for the most part, well behaved. Except for a few occurrences, I never found it necessary to go through their rooms. But the few times that I did, I did end up finding out something that they were trying to hide from me. And I did use that information that I had to address the problem. I think my kids are better off because of it than they would have been otherwise.
So did I do the right thing by occasionally searching their rooms when I suspected something was up? I really don’t know. Maybe there was another way to handle it. I do know that if, given the exact same circumstances again, I would do exactly the same thing again.