The liability portion of the policy helps cover bodily injury and property damage claims for injuries or damage that happen to third parties in your apartment, or even as a result of your normal activities away from home. A slip, fall, or dog bite can result not only in medical bills that have to be taken care of, but also the possibility of a lawsuit.
Florida, Kentucky, South Carolina mandate the repair by comprehensive insurance coverage without a deductible because they have found that driving with damaged windshields is dangerous, this is an advantage of comprehensive coverage in these states. This being said, most insurance companies will waive the deductible in the case of a glass repair, so it is worth calling your agent or representative to know your conditions.
Comprehensive insurance is commonly confused with collision. They both insure your car but cover different events. Collision covers car accidents, and comprehensive covers events out of your control. Think of it like this: Collision is colliding with something else (other than animals). Comprehensive is basically all other events. Accidents with animals are covered by comprehensive (and not collision) because these accidents are considered out of your control.