LeBron has had to carry Cleveland for over a decade, so it's not like this is new to him. What do people really expect? Love is averaging 12 ppg this series and he's our second best player. He's surrounded by a team full of OK players, some average and some rubbish players. Irving/Thomas out of this team has changed everything for LeBron. If Love is averaging 12 ppg in a playoffs series LeBron kinda has to absolutely dominate for Cleveland to even have a chance of winning. It's not like he can actually play 35 minutes a game like a Curry, KD or Harden, it's just not a possibility.
He's only been in Cleveland for 4 years And he didn't need to carry them all the time when Irving was there (other than the year he was injured obviously).
And as you said, he doesn't have a lot of support. Though I think he has enough support to beat Indiana. It's not like they have a bunch of amazing players. The casual NBA before this series probably couldn't have named more than 1 player there. You could make the same argument that Oladipo is surrounded by a bunch of "okay players". But they play as a team. I blame the coaching 100% for the struggles.
But overall I think you are agreeing with me. This is going to be the hardest run LeBron has had since probably back in Miami. And he had some support around him back then. He's going to have to leave everything on the court to just make the Finals. If it wasn't LeBron, I wouldn't give the Cavs a chance.