Che cosa significa That the pandemic has forced us to stay apart when we need one another most doesn’t help, either. ?

Vedi una traduzione

“Staying apart doesn’t help us not to falter even [though] evidence from past catasrophes did suggest [that] we falter psychologically not because we don’t have personal fortitude, but because we have too many external pressures”?
2 quick grammar fixes*

So, yes sort of, but there is a little bit of nuance.

When we say something like:
[Here is the situation], but/and [the other thing] doesn't help either.

[the other thing] is not a main issue, it's just another thing that makes the situation worse.

so here they're saying
[People falter psychologically because there a lot of external stress], and [keeping people apart just makes things worse.]

if that makes sense?