From the NIST report.....
As they were leaving the building through a service door in the southeast corner, glass was breaking from overhead. After it stopped, they exited and saw that the fires on the south face had moved to the east face and were moving north. They reported that flames were coming out of the windows, and that the windows were breaking out sequentially in groups of two or three every 15 min to 20 min. The rooms appeared to have reached a flashover condition,........................
At approximately 1:00 p.m., an OEM staff member, a FDNY Deputy Chief, and a FDNY Battalion Chief entered WTC 7 to further evaluate conditions. The OEM staff member reported that they entered WTC 7 through the door near the southeast corner on West Broadway and proceeded up the B stairway on the east side. They stopped at the 3rd floor level. The atrium was filled with dust but had no significant debris. As they observed the area, they heard the building creaking.............
At the 5* floor, they moved to the A stairway and proceeded up. On the 8* or 9* floor, one of the group said he saw two elevator cars ejected from their shafts and in the hallway. Looking past the elevators, they could see a gaping hole in the south face from around the 6th to the 9th floors. They could see one floor below and two to three floors above that location. A lot of the core walls were destroyed, and one individual reported that he saw columns hanging from the floor above. They did not observe any fires at this time on the 8* floor or 9th floor, but the interviewee reported that they could hear fires burning well above where they were standing. Also, they continued to hear creaking noises in the building. As the FDNY Officers continued their inspection of WTC 7, they heard a loud noise, and a Chief decided that they should evacuate the building.....................
When a Chief Officer got to Barclay Street and West Broadway, numerous firefighters and officers were exiting WTC 7. These firefighters indicated that several blocks needed to be cleared around WTC 7 because they thought that the building was going to collapse.
In my opinion, considering what happened earlier in the day, and what happened later, the NYFD not only made the correct choice, they made the ONLY choice.