First of all, he blamed himself cuz he failed them, he wanted to protect them but he couldn't, of course he shouldn't blame himself at all, his higher level doesn't matter when you are heavily outnumbered.
Additionally he suggested to farm at the usual grounds as they are safer, the girl's letter probably saved his life btw.
Also, we can now see what PVP is like in this game, seems to me it's all skill based and not gear, although the Alliance shields and swords seemed dangerous, all they really had was guts to attack a smaller group with their seemingly overwhelming power, as it showed it didn't help them at all.
Kirito's "Gift" was nice, although next time, if he will need to at all, he will do everything only for Asuna.
As the Op suggests, much higher levels will not be occupied by many players at all.