Whast are u aasking any more details ]
For them Bastille was the symbol of Monarchists tyranny.
Those who were opposing the king were locked there, so releasing them would mean that the King lost power over his subjects. Moreover, those who suffered from Kings injustice are likely to become leaders of antimonarchists movement, as their devotion to the cause is unquestionable.
if you are talking about WW2 then yes that is why we had the baby boom because we thought we were the best and wanted to celebrate winning the war and coming home alive.