Why can't we reason together about tough issues?

One reason I think we find it hard to discuss tough issues reasonably is that we use language to create our world rather than to describe it. For example:

What is a fetus? An unwanted unborn baby.

What is an unborn baby? A fetus that is wanted.

So, to the person who is pro-choice, it is a fetus until it is wanted.

Likewise, to the person who is pro-life, it is an unborn baby until it is unwanted.

No wonder we cannot discuss this without arousing the flames of emotion.