Excuse me? When the enemy jungler is ganking the jundler has 4 options:
- countergank
- gank another lane
- secure an objective
- counterjungle
If you think point no.4 is useless let me correct you. Taking the enemys blue buff for example while he's ganking who'nt only get me some ex that he will lack it will also have an efect on their mid laner. and even if you die he xp they get will be shared between them while i get more exp than him which in the long run will turn him useless.
And ofc you can't blame your you're getting ganked if you have no vision in your area. and if you see your jungler on the far side of the mak play a little safer especially if you don't know where the enemy jubgler is.
Also wanted to note that you make ganlking seem so easy. If there isn't an opportunity for the jungler to gank the best he can do is focus objectives and farm.