:but babies, by hormonally initiating labor, give their mothers some of the most intense pain possible.  We persumably have the right not to be woken up at 3 A.M., but I imagine all of us, just by virtue of being normal babies at one point, have long since given up that right. 
 :OK then, you lose your rights if you breach somebody else's "on purpose, and for a good reason." I doubt it will get as pedantic as "being woken up at 3AM" but by giving this example, I hope you see my logic. 
 :What's your reason for saying it is virtually impossible to interact with the rest of the world without violating somebody's rights.? Have you so little faith in humanity? And if we DO break other people's rights, then we should accept what comes to us. 
 :Why do you say that we ought to kill murderers?  - Because they deserve to die for what they have done. Also, murderers are most likely to do something bad again. I know every case is different, but the cases which the people had a really good reason I don't think of as murder. 
 :This is good. I think all laws should be short and simple. Pointing out flaws in my ideas will help me to form something that's simple and fair. But I don't think you only lose rights, you can also gain or re-gain them by doing good things. So this part also helps to solve the "baby crying makes mum suffer", and another scenario in which a person "kills 1 to save 10000".