Warding is a proactive defense/offense measure not a reactive one.

I hate the common reasoning when someone who just got ganked being told to ward. Not that warding when behind doesn't help, but it becomes much less effective tool when behind in lane. Warding isn't going to do you much good AFTER you were already successfully ganked. Its not going to physically stop the jungler and ahead laner from diving your weaker self.

I feel a lot of newer players or one who still haven't understood the power of vison fall into the mind set that after being ganked and buying a ward or using their trinket but still end up getting ganked start thinking that vision/warding isn't useful. That's when I want to slap someone and be like "its not the wards fault you didn't use it when you could still survive/turn tower dives not after it."

Just me speaking my mind on something that seemed relevant.