Is it right to afk from a 30 minute long 3v5? Hear me out

Remake failed because the other two on my team "didnt want to" (what the hell?) anyways OUR team went 32 - 20 in the 3v5 and all three of us were fed and decently farmed. I considered afking (trying to 3v5 players of equal skill is likely to be a waste of time after the first 20 minute vote failed but because im not the type to afk from a game. It lasted about 30 minutes with us slowly going from winning team fights to getting picked off and slowly pushed into our base beacuse noone besides my self could push well enough to keep the minions out. Would it have been morally okay for me to have left them in this game or is it right that i wasted about 10 extra minutes of my life? We all did well but the match was overall pointless.