Not sure what you're getting at. No one said things should be banned by default. Now that it is up for debate, as you mention, the question still is: why allow it? What benefits does it serve?

I'm rather indifferent on the issue - I guess by default that means I'm in favour of the current status quo

But if you're going to ban something you have to have a good reason to ban it, not lack of a reason to keep it.

Ah, well, I'm more of a "ban by default" kind of person. As for the answer to implicit question:

https://news.ycombinator.com/item?id=13452727