I still remember when the peer pressure got the better of me. The sheer fun and pleasure made me go over to the other side. It was first year of college and despite of everything I'd been taught, I was able rationalize it nonetheless. Since then I've always tried to help others realize what they're missing out on.
People have their reasons too - Religious, ethical or mere choices they make to prove to themselves that they're in control. I've realized it's not appreciated when the 'beliefs' are questioned and hence I avoid it. Although the pleasure in seeing people appreciate the other side when they decide to move over is worth the effort being put in to 'change' them.
One such conversion took place today. When subway delivered subs which were marked incorrectly. A dear colleague of mine who boasts or rather used to boast of being a 'pure vegetarian' had nibbled a couple of bites before he could realize that what he's eating doesn't taste like the Veggie Delite he ordered but had gotten swapped with the Chicken Tikka. He immediately gulped down the whole bottle of Mango Slice to cleanse himself but it was too late. He knew it was too late. The chicken was inside him. He couldn't boast anymore and everyone knows the first time might take time but once you're on the other side There's no stopping you :)