You would be surprised what various safety nazis can come up with - and then there are so many procedures to follow and gear to wear that people skip it all instead of paying attention where it actually matters. Too many pointless warnings and people stop noticing them all. Too many interlocks and they will be so cumbersome to use people will bypass them.
A course may be a sign that there's a problem, or that the vendor is American and covers their posterior against hungry lawyers that always circle around there. In this one specific case, you get a laser beam out of the end that can be pointed in open-space direction, so a bit of extra care is needed.
In perspective, people are driving around huge chunks of metal, with dozen or more of gallons of flammable fluids, without blinking an eye. A much less dangerous laser raises eyebrows.
My K40-III has plenty of unsafe modes. Little to no safety docs too, and no switch to cut off beam when the lid is opened. But that comes with the low-cost territory and just means you have to be appropriately careful, and not opening the lid during operation if you don't really have to (e.g. inevitable minor fires) and pay attention then. I'd prefer Origami over the K40 but it came earlier and the cost was much lower.
Also, free CO2 laser mirrors: