Same reason that I don't know how kids manage to survive school/college anymore. Everyone has a camera at all times, you're encouraged to post every dumb passing thought, and everyone loves internet outrage. You can't say something dumb, make a mistake, or in this case do anything stupid or violent, abusive, etc. and get away with it being a rumor, hearsay, or he said/she said. There's receipts for everything these days, so rumors that would have spread about some guy being a cheater or wifebeater in the old days turns into video of the guy beating his wife, which forces a totally different response.
NOT IN ANY WAY CONDONING ANY OF THIS, just saying that before this would have been a rumor or swept under the rug, cameras and internet force it all into the open with proof. So now there are scandals vice rumors. It's good for the parties being abused, but makes it look like it's suddenly a new problem when in reality we just FIND OUT about it a lot more now...