Can humans just fail to be rational?

Seems like humans are rational: rationality is just acting in accordance with reason and I'm pretty sure humans do act in accordance with reason. Humans seem to be able to reason and make decisions based off of reason. <br><br>I'm currently reading this essay "Unconditional Cooperation and the Retaliatory Use of Force" by Michael Huemer. He starts by saying that humans are rational: "people generally act on a rational consideration of the incentives provided by the consequences of their actions."<br><br>Humans are rational and we can act in accordance to rationality. Humans are naturally good at logic. Humans can reason. Humans are rational. Humans are generally rational. I mean: humans are generally rational. I mean: humans are rational not rational-ish. But I mean, maybe people aren't 100% rational. Maybe humans are rational-ish. Idk. <br><br>I guess what I'm just saying is: maybe humans just generally tend to be rational but can fail to be. Humans are just 90% rational. Not 100% rational. And I guess I don't see how humans could be 100% rational. Humans just generally tend to be rational but can fail to be. Idk. <br><br>So maybe people aren't rational just mostly rational and sometimes irrationally: maybe humans just generally tend to be rational but can fail to be. Idk. <br><br>Humans are generally rational. People are rational, just not 100%. Humans are rational but can fail to be rational. Idk. <br><br>I guess it's just weird to say that humans are rational and then see that few humans are fully rational. So maybe not many humans are rational in practice just humans are generally rational. Idk. <br><br>Or maybe rational people aren't rational and irrationally people are just as rational as rational people. Idk.