It is innate human reaction to always try to maintain the status quo. The brain prefers to fall into prerecorded routines so that it can save energy. Real thinking is kept to a minimum as a survival mechanism even in an age when for $1 you can buy a 2000 calories bag of chips on almost any street corner.
When confronted with loss and change it is easiest and feels best to try to get back what you have lost, but the reality is that everything you have comes at a cost. At some point you made the decision to pay that price, but the correctness of that past decision may no longer be appropriate.