If you start out trying to enforce the contract as agreed and think that means that Patrick is 100% responsible, then Patrick next has a claim against his investors for the harm their mistake caused him. This claim would offset their claim against him for making the same mistake. You end with them needing to split the losses.
Wait, so if someone breaks into my house and is accidentally impaled by the set of spears that I by mistake only very loosely fastened to my ceiling with a string that too goes across my floor, then that guy has a claim against me?