It's called balance, high rate of fire low damage guns take 5-6 shots to the body 3-4to the head,low rate of fire high damage guns 3-4 to the body and 2-3 to the head
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You can put rapid fire on I though..
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Yes you can on some of the guns but doing so makes you lose stability and range causing you to have to get more shots on the target at mid range. However at close range you will gain an advantage, but using slow rof high damage guns give you an advantage at mid to long range, in the end it all depends on what playstyle you use.