I love Jessica and SNSD but after I read a comment, I have to admit one thing: Jessica is not innocent at all.
First, working as both an idol and a fashion designer is hard, her schedule is like crazy, she may get tired and doesnt have enough sleep and that leads to a really bad thing. SNSD made her to chose because they just want the best for her. Not that because they hate Jessica. They are all grown up now, SNSD understand what are they doiing