Jesus laid down his life for all of us collectively, but to a much finer point, he died for each of us individually. It is easy to disavow personal ownership in the ramifications of something when we are part of a crowd, but it becomes very clearly an individual matter when we form a personal attachment, or take a leadership role. Jesus died to save each of us as individuals, and we are each responsible for our own actions, salvation, and in maintaining covenant with Him.