Simply, because terrorist do terrorist attacks to send a message and to cause chaos. Terrorist target places like New York due to the very high population and population density in New York. Terrorist also target places like Washington D.C. because that’s where the United Sates Federal Government is located. That’s what also makes D.C. nearly impossible to attack due to its intense safety measures in place.
To simply put it, it’s because New York has a very high population and population density and D.C. is where the U.S. Federal Government is located. Terrorist attacks at low population/low population density/small government areas don’t send as big as a message/doesn’t cause as much damage unlike New York and D.C.
