Decocking the Hi-Power with a round chambered is scary.
I think you may be confusing conditions 2 and 3. Lowering the hammer on a loaded chamber is condition 2, and is generally accepted to be an unsafe practice with a SA pistol. What the manual likely refers to is condition 3, which is hammer down on an empty chamber. There are kits available for the BHP (and probably others) that will allow a safe condition 2 carry by adding a decocking function. They're a neat idea, but I don't think they have been well received.
FWIW, every manual I have seen in recent years for a SA pistol (1911s and BHPs, mostly) has recommended condition 3 carry. As HorseSoldier mentioned, other manufacturers do the same. You'll find manuals for SA/DA pistols with decockers that recommend condition 3 carry. It's a liability cover for the manufacturer and is not sound advice for carry.
A soldier is likely to be trained to carry in condition 1 with a SA pistol and condition 2 with a DA pistol. Exactly which one would depend on what pistol his army issued to him. I can imagine a situation where orders might force him to carry in condition 3, but that would not be the preferred method.
Edited to add:
Shear_stress, we posted at the same time, so I didn't see your post until just now.
You are correct. I don't recall if it was the IDF or the civilian police or somebody else, but *somebody* in Israel was trained to carry in condition 3. If you'll search the S&T forum for "Israeli draw" you'll find something, and the video might still be there. The "Israeli draw" involved drawing a condition 3 weapon and racking the slide to chamber a round in a very quick motion. Around here, it is generally regarded as a neat trick, but one with limited practical use.