...Some people hurt so much they can't take what they need, even when someone wants to give it to them. (106)

Because depression is so thematically powerful and so dark, when it's very severe, it can make people feel not only as if they've lost a loving connection, but as if the whole world is devoid of love. So if we wonder how somebody could take 149 people with him when he commits suicide, one answer can be that depression, when it's most severe, can make people feel that life is completely without value, not just for them but for anyone.

People react predictably, especially when they don't have time to think.

...Some people hurt so much they can't take what they need, even when someone wants to give it to them. (106)

Relationships are never chance events.

The good guys had to operate on a higher level than the killers--just for society to keep track of who was who.

The roots of any evil deed can be traced to the perpetrator's refusal to experience pain.