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Your analysis is correct.
When the gun is assembled, the camblock prevents the trigger from moving upward far enough to disengage from the frame.
When the gun is disassembled (field-stripped) the hammer and trigger bar work together to keep the trigger in its proper position. If the hammer is manipulated, that moves the trigger bar to the rear and allows the trigger to disengage from the frame to the point that it can be removed from the gun.
If the hammer is not manipulated, the trigger remains secure but if the hammer is pulled back while the gun is field-stripped, the trigger can literally fall out of the gun if the gun is inverted.
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