Why are guinea nigs so aggressive?

My friend just gave me 4 of them 2 black, 1 brown, 1 white and said theyre all adults. because she was tired of taking care of them. They didnt even come with a cage, just a large long plastic box. I woke up like half and hour ago to them screaming and scratching. Now one of them has a really bloody ear. I took the hurt one out and put him in a laundry basket in my closet. I left lots of watermelon and broccoli in the cage so i dont understand. Two of them have marks on their belly. One has inflatided genitals and the one female im not sure if shes pregnant because shes the smallest and always gets bullied out of food but ive seen them raping eachother before and my little brother was laughing. I just smacked him in the side of the head. One has no discernible genitalia so i guess he can be female too or just young. They bute my little brother when he picks them up. They also have really long nails. What can i cut them with? 

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