PSA: When the enemy team has divers, you should peel for carries
Last game was a prime example of what happens when one team peels for carries and the other doesn't. Now, here's the composition of each team.
Team A:

Team B:

Now as can be seen, both teams have members which can make the lives of the carries a living hell. The difference is, when you peel/protect those carries, they can actually do their job.
When Team A decided to focus on peeling for Vayne, she was allowed to carry the game through damage. However, Viktor was usually left behind so he quickly got deleted by Kha'zix or Leblanc.
When Team A decided to focus solely on diving and trying to kill leaving both Jinx and Leblanc without protection, letting them die quite quickly.
The standard fight would go as follows: Tahm starts his ult to take him and Kha into the enemy backline, meanwihle the enemies notice this and jump straight towards leblanc and jinx. Leblanc has the mobility to escape while jinx does not, and she is either 3-shot by an ulted Vayne or bursted by Viktor.
Post-game, Jinx is flamed for having multiple deaths and very little damage, despite her dying from high burst and stealthed champions (Vayne and Shaco) with little time to react, and no protection from allies.
Moral of the story, the carries on team A received peel while team B did not, and that was evident based on how well the carries could, well, carry.
PROTECT YOUR CARRIES!