Those people who observe the Lenten season should celebrate Fat Tuesday if they wish; but to celebrate Fat Tuesday and not observe the Lenten season doesn't make much sense, since the intent is to splurge before having to go into that austere season. People who celebrate Fat Tuesday but then don't observe Lent, well, that doesn't make much sense to me.
As I understand it, it is just a symbolic festival that presages the oncoming of Lent, a time when people typically give up sensual pleasures of the body. It doesn't seem unreasonable to have one last bash before doing so. It actually seems to be a natural demonstration of the value of what is being given up - the celebration of the pleasures of life before going into a period of their denial.
Fat Tuesday shouldn't be something imposed on everybody. At best, the day is a regional phenomenon, and there is one other matter to consider. Fat Tuesday has its origins in religion, and the last thing this country needs is another religiously based holiday to argue over in regards to its meaning.
This is a lack of control. If you know that a period is about to come up which does not permit you to eat something that you particularly like, you should not engorge yourself the day before. What if you died? Because you drank or ate so much in a gluttonous way?