If fever is such an important response of the immune system to fight fight infection why do hospitals give meds for them?

For comfort's sake: It's certainly not harmful to treat a fever; we do so mostly to make patients more comfortable. Any benefits to fever are mild and theoretical. I suspect your provider was trying to convey the idea that fever itself is a normal response to infection. Fever itself does not always needed to be treated, unless it is very high (104 degrees).