The meaning of this statement is that death is inevitable, no matter what our circumstances may be. People cannot escape it and must accept it as part of life. Capulet is using Tybalt's death to emphasize this point. I don't think that most people think this way, as death is still a difficult concept to grapple with. It can be difficult to accept the finality of it, and many people may try to deny it or reject it. Personally, I don't think this way about death. I believe that death is part of life, but I don't think that it should be accepted complacently. Instead, I think it should be viewed with a sense of solemnity and reverence, as a way of honoring the life that has been lost.