Almost one month after Jessie James Decker had to defend her three kids — Vivian, Eric II and Forrest — after they were criticized for having abs at a young age, the singer revealed why she felt the need to speak out about the ordeal. “You know, I think for me, I’m proud of my family, and I’m proud of my kids,” the Dancing With the Stars alum, 34, said in a new interview. “And I’ll always want to encourage them to do what they love and what their heart wants. They love sports, and they’re active. And so, for me, I am so proud of them, and I will always encourage their passion for sports and be…