Seriously speaking, this is one of those tough subjects where it may be hard for them to balance it to make everyone happy. You afk'd for some time (not your fault in this case, but in case of other times of other people, sometimes it is) and the harm has already been done (yet again, you carried, but other times the afker is carried or the game is lost).
In other words, you feel harmed and it definitely is unfair as it doesn't encourage you to return to the game, however there are cases when someone who afks does not deserve the reward and If they were rewarded nontheless, other people would complain it does not discourage afking enough.
I'm not going to say which side has more frequency or is more relevant, just wanted to clarify the other side.
Jokingly speaking:
you might as well not help your tea anymore
Indeed let the tea be alone in it.