I often use a hook sandwich for the chorus and it works great here.
I wasn't sold on this line:
What disaster will it take before we learn?
Are you trying to say "How much more crap can it take?"
And this phrase "Has it been too long" - maybe sth like "Has it suffered too long?"
And for the stumped line maybe something like:
Can we find it in our hearts to shine a light into the dark, deadly night?
I don't know if a chorus really makes sense after the bridge - the "call to action" seems to tell us what to do, but then we're stewing about it again at the end
Paul