Why the instinct to remove it is dangerous
A conscientious cleaner will want to make the situation safe by removing the item, and that is precisely how needlestick injuries occur. Reaching into a bin, tipping a bag to see what is inside, or attempting to transfer an item to a sharps container all involve handling waste that should not be handled by anyone without the training and the equipment for it. None of those actions are within the role, regardless of how careful the person intends to be.
So the instruction is stated as a prohibition rather than as guidance. Do not touch it. Do not move the bin. Do not tip or compress the bag. Secure the area and call. That is unambiguous enough to be followed under pressure, which matters because the moment of discovery is exactly when a person is most likely to act before thinking. Unambiguous instructions are what hold up in the moment somebody is most likely to act first.
