Why do people care?

why do people keep harping on teen pregnancy???? its retarted because mother mary had jesus at like 14 and ya she didnt have but still. back in the 1600's thats how things where.14-18 year olds would get pregnant all the time. so what if some of the world has matured and some hasnt. its human nature to get pregnant and have babies no matter what age you are!! tecnically its not a mistake its a choice.