| The thesis of the momentariness of human existence has had a recent defender in Derek Parfit. |
| Parfit and others have criticized Taurek's line, and it continues to be discussed. |
| Derek Parfit presents his Mere Addition Paradox in order to demonstrate that it is extremely difficult to avoid the Repugnant Conclusion. |
| Thus, Parfit uses destructive criticisms of the notion of personal identity to undermine egoism and support his own consequentialist views about ethics. |
| However, Henry Sedgwick and Derek Parfit advance partial harmony of deontologism and consequentialism. |
| And in order to avoid it, Parfit has embraced perfectionism. |
