Abstract: The present paper offers a critique of Block on the issues of abortion and child abandonment. Block regards aborting a fetus or abandoning a child as an instance of exercising one’s libertarian right of expelling trespassers from one’s private property. I argue that the above reasoning is flawed due to the lack of the appreciation of the fact that if one voluntarily initiates the causal chain which leads to someone else ending up on his property, the latter person cannot be considered a trespasser. Furthermore, in the light of the above observation, any direct effects resulting from that person’s eviction should be considered the responsibility of the property’s owner. All of this follows from the simple logical fact that in all links of the causal chain under consideration the owner is the ultimate causal agent.