Liability insurance arises because individuals and businesses have legal obligations not to cause bodily injury or property damage to others. When someone is negligent, the law allows the injured party to seek compensation. These legal obligations can be substantial and financially devastating. Liability insurance provides protection by transferring the financial burden of compensating others to an insurer. It ensures that the insured can meet their legal responsibilities and that injured third parties receive compensation.

Option A is incorrect because liability insurance is not for protecting oneself from personal risk—it protects against obligations to others. Option C refers to social norms, which may influence behavior but do not impose enforceable financial duties. Option D refers to ethics, but ethical feelings alone do not create legal liability.

The key reason liability insurance exists is the legal requirement to compensate others when negligent, making B the correct answer.