As per the story, Krishna married 16000 women who were kept in captivity by Narakasra, after Srikrishna killed him. All these stories have meanings behind them is what people fail to understand and they take it all in a materialistic way. From the social angle, Krishna was a samaja sudharaka (social activist) as otherwise, these women wouldn't had the respect in the society for no fault of theirs. From spiritual angle, Krishna is the internal soul in all and he possesses everything. One thing to note is that Srikrishna never married anyone with force and he married only because those girls were so much in love with him and won't settle for anything else.
Other misconcieved notion is that Krishna stole buter once he was a kid. The purpose behind that drama is to teach moms that they should feed their children first, before selling the milk/food in the market.
