That's all true guys, I agree and have seen and experienced the same things that cause cuts like this whether it is caused by a person, road hazards, road conditions, manufacturing defects, manufacturing processes or a combination thereof.
However, the "slices" that suddenly appear on tires even when brand new and nothing but good pavement has met these tires is what I am talking about here. It is reasonable that there simply can NOT be such a widespread existence of box-knife wielding punks hell-bent on slicing up motorcycle tires to challenge the logic of why carbon strips are used by manufacturers. As I said it seems that the most logical reason was someone had caused this damage with a box-knife or that it could have been the other reasons you all also know can cause this.
Disregarding these other things though and according to manufacturers these "molten carbon strips" are placed in the tire during manufacturing. Since rubber is extruded and cooled much like molten lava during the manufacturing process it is also reasonable that due to expansion/contraction/heating/cooling/suspension processes combined with the tensile/chemical/physical differences of all the materials being used to manufacture a tire are what cause this "irregular" pattern at differing tread depths within the tire itself and that we eventually see on the surface of tread wear areas. Much like the earth's strata layers being exposed by erosion and the deeper you go the stranger it may look but it would still be normal according to what we know of the earth's properties and characteristics.
Thus, these slices appear during normal tire use, are irregularly shaped and patterned and resemble razor cuts or road hazard damage such as we may think or suggest but are not actually damage and this only if the carbon strips are the only thing causing this "sliced look" in the tire. According to the manufacturers that is!
I've never talked to a tire manufacturing rep myself but I just might if I can find the time. I simply came across that RED TEXT NOTE on a Michelin site and passed it on. Obviating my inability to perform a chemical composition analysis all I can tell you with certainty is that it is an annoying thing to find these on tires.