It’s all about proportion.
As @funkdaddy points out, we have found out that EVERYTHING is dangerous. And since you seem to think that the, “As long as you don’t eat these things every day it’s fine.” crowd are misleading, you are actually part of the reason that there is a debate.
Which do you think is closer to the truth;
A) Red meat is perfectly harmless.
B) Red meat is so harmful that even looking at it will kill you.
C) Something in between.
From the looks of it, you put enough stock in their report that we can eliminate A right off the bat. However, your statement that they WHO isn’t claiming that any amount whatsoever causes cancer implies that you don’t place meat in the same category as plutonium either so B is off the table too.
Normally that would leave C, but that would mean that you already know all the relevant facts better than the experts do, which I doubt. The only way around that is to admit that you do understand, at least subconsciously, why there is debate and are merely having a tough time adjusting to the fact that others don’t see things the same way you do. In other words, you already know the answer but are having issues accepting it.
(Don’t take that the wrong way. I have a fairly big ego, so there are some things I have strong enough opinions on that I myself don’t see the need for debate. Flaws like that make us human. But back to the question.)
There are many people who aren’t 1,000% sure what these findings actually mean. People who looked at this headline and neither dismissed it nor shouted “MEAT IS POISON!” and scurried off to hardcore veganism. Those people who don’t have a concrete opinion based on omniscient understanding of the issue are still looking for the meaning of these findings amidst a flurry of knee-jerk reactionary arguments from both extremes will argue until either a consensus is reached. Of course, enough people are polarized at one extreme or the other that consensus is impossible, but c’est la vie.