Joining Private games you weren't invited to

I and two others from the Dragoons joined game number 2,000,000 because I was able to guess the PW on my very first guess. Some might call it wrong, but if the PW is so obvious, was it wrong of me to do this, and than give the PW to fellow clan members so they could join. Does making the game truly give someone exclusive rights to that game if if it's PW protected with a ridiculously easy PW. If so, than I guess we are operating on an honor system of sorts that says don't join a private game if you're not invited even if you know or guess the PW.