If it's a waste of time, why not just ban the people who would otherwise be confined to the Showcase?
Because it is "showcase". It hasn't happened for a long time now but once upon a time I found the creo posts in EvC rather useful. A few friends (and others) thought that "balanced treatment" was the right way to go with the "controversy". I may not have any of that left but I'm sure others do.
They were very quickly convinced that there was nothing to the other side of the controversy after browsing creo posts here. The showcase captures really great examples of the astonishing nuttiness of the creo supporters. Just left to rant themselves they supply such wonderful ammunition if you do have someone thinking there is something to consider.
There is, of course, also need for more rational detailed discussion of the arguments put forward by the more thoughtful representatives of YEC, ID and other positions. This is to expose the flaws and it is very educational to all.
We owe gratitude to all those knowledgable folk, on BOTH sides, who take the time to supply reason and facts. It's too bad there is something of an imbalance between the two sides in that regard.