system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: When defusing a bomb, why can’t you just cut all wires at once?
gpt
Most bombs are simple and cutting the power or detonator wires would disarm it.  But it's trivial to design bombs with failsafes so that if it were tampered with, it would explode.  Of course, there is no standardization of such design, and certainly no standard colors (i.e. "cut the green wire" is ridiculous)

There have been bombs specifically designed to fool the disposal people with the actual trigger mechanism obscured.  Cutting the "obvious" wire being what causes the detonation.

Sometimes X-ray machines are used to examine the bomb, but in reality, if it's not clear how to defuse it, they will just evacuate and blow the bomb up "in place".