This is a strawman argument extended by those who rely on supernatural explanations. In reality, people's utterances and actions are part of the environment that determines future actions, just like everything else.
Sure, but that still doesn't matter: the fact that I wrote my previous comment is what caused you to write your response, but it's not like I had a choice to write that comment or some other: the fact that I wrote that comment, as well as everything that led to me writing it (conversations with teachers, my parents letting me watch English cartoons so I learned English, etc), were predetermined the moment the Big Bang happened, or they're just a quantum fluctuation.
What I'm saying is that there's no logical point to the concept "should" unless you have some concept of free will: everything that happens must happen, or is entirely random.
