I hate to have to repeat my self but it is not only my perception of ethics it is also that of many genealogical societies throughout the world. Obviously you will do what you feel to be correct in your own mind, just as I will do.

Fact Ancestry will pull down living people's information when database submitter information is unavailable

How would YOU like it if an old classmate whom you did NOT like called up a neighbor of yours trying to locate you for a reunion. Your neighbor the provides them your contact information without permission.

Would you like this? No. Personal information SHOULD be respected when at all possible. The problem is some researchers get lost in the information and forget what it's like on the other side of the coin.