Well to insult the junglers is not going to help. That being said i am a jungler and honestly many do not know how jungling functions most less how to do it right. I have seen people never really farm just to chase kills and fall behind to ones that never leave the jungle. That being said if they are up against your tower early and i was in that side of the jungle i might pop in lane to give them a scare or go full in for a gank if you have enough life that i can expect that we are not going to feed them 2 kills. if you're less then 30% then i may scare them to back them down but at that point it's you should play safer or port back.
This is all if it's not very early game.
Now if i am on the otherside of the map there is little i can do to help you as i don't have port i usually have flash and smite. At this point if you are being pushed under when i am done bot i will head to you but jungle can't just stop farming to help as this will throw us behind so again if you are losing lane you need to play safer so we can help you recover. Honestly as well we also know that some match ups in lane are not winnable. So it's ether support the people that will snowball and destroy the other team or help the team mate that is falling behind,can't hold the lane,or just generally making bad plays.
I had a game like this the other night when i kept a harass on nasus's lane cause our bot was weak and mid held their own well but i knew if i could help him bury his opponent early as her strength was early poke nasus could kill her as long as he was able to out farm her.Guess what happened? bot whined as they were making bad plays nasus got fed and he won us the game along with me and mid. This stuff has to be kept in mind while jungling.