I don't mind them looking in my luggage. What I do mind is the zip ties that they use to seal it afterwards. They are a pain to remove, since you can't carry anything that will cut them in your carryon.
Hey TSA folks - if I wanted my luggage locked, I'd put a lock on it. No locks should = no zip ties.
Thye gave you zip ties? Lucky you. The last time I traveled, I gave them zip ties to secure my bags, and they never put them on. Instead, my bags were left open for all to go through.