Article 3 says that "Everyone has the right to life, liberty, and security of person." The practices you describe may seem to be in tension with this right. While many might disagree, I would say that the Declaration of Rights was not written with fetuses in mind, so we can take a fairly narrow reading of it when it comes to abortion. Mercy killing, one might argue, does not violate the spirit of the Declaration since presumably it is not taking a life that is not going to end anyway. The death penalty is trickier, except to say that at the time of writing the Declaration, capital punishment was a long-standing legal tradition in many, probably even most countries. So they probably didn't have that in mind, as long, of course, as due process has taken place, and punishments are not out of proportion to the crime.