Imagine having to testify in court that you didn't actually say the things that the other attorney found in your social media posts, knowing that you really didn't say them but also knowing that no one's going to believe you. "Oh, sure you were hacked. _eye roll_"
This isn't the old days when everything on the internet was in good fun. For a lot of people these days, internet unironically srs bsns. And a lot of those people think it's okay to harass folks over their passing thoughts on the internet.