Take this for example, An elderly person saw you taking too much soft drinks, and she tell you all the cons about soft drink and tells you how much she had suffered drinking too much soft drinks. And she wants you to stop drinking it for a period of time to kick that soft drink habit, and guess what? She's drinking soft drink heavily in the public even though she is warning people not to take too much soft drinks.
What wrongs with this world? I'm just letting what I think out. I'm just using that example to replace what i want to say. Don't guess, you'll never know who it is and don't bother asking =).