All sciences are measurable, ethics and philosophy are not measurable. Arguing on a non measurable thing is pointless. They are at best an opinion until measured.
Discussion
I made my university studies on philosophy so we are not going to achieve a consensus here. But I understand your point. I disagree, of course.
You see we cannot achieve a consensus because it is not measurable. If you want to continue this topic and somehow work together to come up with a system to measure ethics and philosophy then I am happy to collaborate.
That would be a great goal to achieve, maybe at some point we'd reach some interesting point!
As I see, we cannot achieve consensus because we have different points of view about what is or not arguable, not because it is not measurable, as I see (the condition of being mesurable to argue is yours, I don't think its mandatory).