Populists where for the american people. Not for the immigrants.<span />
C) tensions in the Cold War between the United States and the USSR increased.
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.