The OTP ought to cut severely in the hyperbole. There is very little (read: no) "bad news" in all of this. Most of what is brought up is FUD aimed at fooling people to think the North Koreans "failed" again (as crazy commies should). Truth is: this time they didn't.
1) Tumbling does not increase the changes of a collision at all. It is completely irrelevant for the collision danger whether a satellite tumbles or not;
2) Tumbling does not really influence the orbit (only in the final stages of decay it does). Indeed, it is completely unclear what is meant by a "stable orbit" here. ALL satellite orbits decay over time, so NONE of them is "stable". Probably, it is meant to imply that the Korean satellite has no reboosting capability. That is probably part of the design (many simpler satellites have no reboosting capability).
Yes, maybe the Koreans have no control over the attitude of the object. But that doesn't matter much: nothwithstanding Korean claims of it being a "weather satellite" this was probably never meant to be a truely functioning satellite.
The fact is that the North Koreans managed to successfully bring an object into earth orbit this time, and that in itself is an achievement. Whether you like them or not (and I don't like the North Koreans), those are the facts. No amount of spin and hyperbole about "danger" and "bad news" can take away that fact. This is all simply FUD.