Society

I respect that society views certain words to be wrong, but I don't understand how some words have become "bad words" and other words that mean the same thing are okay; That the word gay could be transformed from meaning "happy" to describing a persons sexuality. I don't fully understand why drinking alcohol, doing drugs and having sex has become "a thing teens do." Why would anyone would allow their children to become alcoholics at 15, be in rehab by 20 *or dead on the side of the road.* It's all come to be so acceptable...