You know the expression think before you speak? I would guess, on a platform where thousands of people can see what you said, screencap it, etc so that even if you delete it, it'll still make the rounds everywhere, you should probably think even longer before opening your mouth. They could have easily avoided it by taking a deep breath and waiting 5 minutes. But instead are going to get harassed for at least a few more days/weeks.
Having said that, I have no real compassion for them. But as someone mentioned before, if Marine and Miko genuinely liked this artist then I'm sad they had to discover that they were just some trigger-happy holier than thou prick.