If they don't get that they can't win the lane after 2 or so deaths, then they aren't going to do much better in another lane.
It is better to tell people to play safer. You need to remind them that it is a team game, and hopefully your jungler is one of the good ones that realizes counter pressure is so important. Whenever I lose lane I breathe a sigh of relief knowing that other lanes are doing fine. That means I have a chance to redeem myself.
If you lose lane it is not the end of the game and you can still make a comeback, but it will be the end if you keep trying to 1v1 that Riven you lost to twice in a row. Being camped isn't a valid excuse. If I find myself being camped I make sure to let my teammates know to push other parts of the map.
While you're farming under turret you should be thinking about how your build path is going to look now and how you will mitigate your loses.