hungry people are we

Why do we human beings have such a hunger for knowledge? Why do we want to know things just for the sake of knowing? Knowing itself isn't necessarily a bad thing, but why does it have to go as far as psychology textbooks saying "Animals (...) must not suffer unnecessary deprivation or pain, and must have their suffering balanced against the potential value of the knowledge gained". So it is okay to let animals suffer just for the sake of knowing?? Come on..FUCK THAT! Not knowing is a part of life. Learning is a part of life. Learning about life is a part of life and so is learning that not knowing can be quite nice too. Although that seems to be a lesson only few of us are willing to learn nowadays.

Another quotation from my textbook (Gray, "Psychology", 5th edition):
observing effects of deliberately placed brain lesions
Areas of damage (referred to as lesions) can be produced in the brains of rats or other laboratory animals by either electrical or chemical means. To produce a lesion electrically, a thin wire electrode, insulated everywhere except at its tip, is surgically inserted into the brain with the help of a stereotaxic instrument and enough current is sent through the electrode to destroy the neurons adjacent to its tip. To produce a lesion chemically, a tiny tube called a cannula is inserted into the brain, again using a stereotaxic instrument, and a small amount of a chemical in injected through the cannula, destroying neurons whose cell bodies are located near the cannula's tip.

What happened to the ethical dilemma's?? Is "their suffering balanced against the potential value of the knowledge gained"? Come on, we're literally fucking with animals heads, destroying parts of their brains! Is that okay in the name of science?
And then we are supposedly so evolved? Well, if you draw a parallel between evolved and morally fucked up then yeah, we're as evolved as can be.