Using metaphors of physical reality for psychological states can make it falsely appear more immutable that it is. It is possible to escape the burning buildings of the mind and knowing that you have agency over your ideas can be an essential part of the reframing/rethinking/challenging that can free you from suffering.
Letting people believe they are in a situation like floor 100 of the WTC and their flesh is literally burning with no escape could be outright harmful and irresponsible for those experiencing suicidal ideation.