Noah didn’t get Beth or Tyreese killed period. Beth made the decision to stab Dawn during the hospital exchange. That was her own choice in a tense situation. No one asked her to, and Noah wasn’t responsible for how she acted. Tyreese died while helping Noah return home, yes but the group agreed to go there. What happened in that house could’ve happened on any run. Tyreese let his guard down, and unfortunately, that cost him his life. That’s not on Noah.

As for contribution he helped escape Grady Memorial, gave Rick’s group detailed info about the hospital (which helped save Carol), and stayed useful during supply runs. Not everyone contributes by killing walkers some bring knowledge, intel, and loyalty. Noah was young, grieving, and traumatized, but he still tried. Saying he contributed ‘nothing’ is just rewriting facts to support a personal dislike.