Of course any phone will bend, but the undeniable fact is the iPhone 6/6+ is weaker than ***PREVIOUS GENERATION IPHONES .. Also consider situations where the previous generation phones would not bend because of their small footprint where the 6 Plus would. I love my 6 Plus, I really do, but I'm not gonna put my fingers in my ears and sing like this isn't a real issue.
If you take reasonable care of your phone it will be just fine. If you want peace of mind get Apllecare + and then if you find yourself stuffed in a car, you can laugh like hell!