How to deal this less-than-intelligent teammates as a tank
** I want to preface this by saying I am not a god, but sometimes I get teammates that make poor choices**
I was playing Nunu jungle and building tank. I was ganking well, but our botlane did not do enough damage to follow up. After laning phase our veigar was melting thier team, and I was ccing/tanking. But, our Garen decides to ditch us right before a teammate and try to push his very behind lane. Then our support decides to split bot. Veigar and I had to fall back to our inhib tower, but in a 2v5 we got dove. Our adc came to help but was so behind he just ran into cc and died. After that moment my team kept picking bad fights. Fights where we were out numbered, did not have our damage, under their tower, etc. We ultimately lost because my team took a fight mid while we had 3 waves of super minions crashing in our base. I could not defend because I did not do enough damage. What could I have done as a tank and the jungler to help my team when they would not group or they would take good fights? All help welcome, and feel free to criticize me!