The Russians will try all the rooms in a house, enter those that are not locked, and when they come to one that cannot be broken into, they will withdraw and invite you to dine genially that same evening.
As the former dissident Vladimir Bukovsky once remarked – referring to the Russian proverb to the effect that you cannot make an omelette without breaking eggs – he had seen plenty of broken eggs, but never tasted any omelette.
Obviously if any actions, even a lunatic's, can be causeless, determinism is done for. If the chain of causation can be broken for a madman, it can be broken for a man.