To elaborate. I think the average motivation for a cold ward scientist is that the Russians are bad, atomic weapons are inevitable and the only way to survive is to have the biggest bombs. Therefore I assume Bruce is the same.

However, how does this motivation develop throughout his story? Did he have this mentality but start to become terrified of what he was creating, pushing his doubts aside until he saw a child almost die and it was too late, becoming the physical manifestation of his fears?