Because WhatsApp is part of Facebook and I don’t trust Facebook. It’s that simple. People act like they are different companies. You can’t use WhatsApp and then be intellectually honest when you criticize Facebook. They are one and the same. The goal with #deleteFacebook isn’t to stop using Facebook, but to diminish the power and nastiness of Facebook the company. You can’t do that if you are using WhatsApp: you are feeding the same beast.