Ive had times that i can not even be under tower safely. Sometimes it is just best to become worth less gold than a cannon minion as you just try to farm. This does not mean intentionally go in and try fighting them and tower diving them etc....... But if you are already under tower you have 2 options. Leave tower and lose farm and become even more irrelevant than you already are, or try to farm still. If you leave tower they will roam. If they roam your allies die almost every time. You can not stop them so you continue trying to farm.
Then you get complained at all game by people that say "just play safe! Just let tower fall! Just surrender!" like they have no clue how to play the game.
The ally jungler often times is trying to help other lanes, but yeah......... Normally if i lose lane it is because the enemy jungler ganked and ganked and ganked. There has been one time recently though, that there was a Tryndamere that played very well and was beating me np as i was Nunu. The previous tryndamere i fought only had a lane phase because of their jungler.
Im not the greatest, but just figured id point out that often times its the enemy jungler that wins the lane for them.... And not the enemy laner. "ward better" well that only works unless they can dive you, which then leads to the first part of my comment.
Also in the situation of a jungler camping, there is the situation of if you stay, the enemy jungler stays. This leaves 2 enemies in top lane for example, vs the 1 top laner in an effort to tilt and set the 1 back. This leaves your jungler.... And possibly mid as well.... To go and gank bottom lane and slaughter them...... 2 enemies down. 4 person pushing a single lane. This is an advantage for your team.