Why is Jungle the hardest role?

Basically, jungle is make it or break it kind of role. If you have a bad jungler and they have a good one, it is kind of over for all laners. Unless they fuck up real bad. Junglers are the snowballers of both teams. If they can add an advantage to a lane and that lane stomps early, then gg.

However, it is a dynamic role, mind games all over the map.