Natural or Rational?

I have a philosophy class in school, and I thought it would be amazing, and it is in one way...but it another it's kinda terrible.

I mean I'm all for rationality, reason, facts, evidence, against faith. But it feels to me like this teacher is set on attacking everything spiritual or everything that has a natural law behind it.

For those who don't have a philosophy book in they're hand, the Natural law basically says that everything in the natural world has a reason or PURPOSE behind it. Like if a hurricane hits, it's because of  humanity's karma. Or if one person dies and another lives, that survivor was probably a better person.

But that can't be right. I mean a hurricane has no conscience or brain that says, "I'm going to punish people for what they did to the earth." It's just a hurricane. It's just a change in winds. And it just happened to be passing through the land that day.

Or if mass murderer and a child both have cancer, and if the murder gets to live, obviously that wasn't the right choice right?

So rationality says that natural law is bogus. And that rationality is what distinguishes us as a human being. What makes things work.

But what about the rationality we are living in. We are constantly reproducing as humans, we have mass starvation and population crisis' everywhere. Rationality dictates that well if we have a growing population, then we need more resources. We need to expand. We need to make more room. We need to chop more trees down. Take more fish to feed the empty mouths. But in that very action of rationality, we are ignoring natrual law. That those trees had a purpose in the area. That overfishing and mass slaughter of animals is leaving more species extinct. That we are in fact temporarily feeding the overpopulation, but also speeding up the end of our own demise.

In the natural law, a virus or a species that it overpopulated, by natural selection and by natural balance, is destroyed or lessend to achieve balance once again. The natural law in fact says, that balance IS purpose. It's what keeps the sustainability of life ongoing.

But becuase humans have conscience, have power, have the unique mind with the ability to go against the natural order, we do not follow the balance. We overtake, overuse, overspend, and overpower our way of life against all other species and inhabitants of this planet. And yet still humans think rationality is better. I mean I understand rationality is needed to govern life, but in matters of sustaining life, which is better to follow? The natural or the rational?