What if it’s a step-father and daughter, and they really love each other? Why should we prevent them from loving whom they want to love?
Let’s say that a man gets married and meets his twenty year old step daughter the next day. He realises, with some dismay, that he’s married the wrong woman. Apart from the obvious turmoil it would cause the family if he were to leave his wife and marry his step-daughter, I would see no problem with it at all.
However, if the step-daughter was a child and he raised that child in a normal father-daughter relationship and then, when she was twenty, realised that he wanted to start a sexual relationship with her, then I, and most people I would imagine, would think that it would be wrong for the reasons I gave earlier.
Natural, as you have shown is a very ambiguous term. For you to claim homosexuality is “natural” and, therefore, permissible because it occurs in nature is to fall prey to the naturalistic fallacy - that behaviours or actions are good merely because they occur in nature. Surely, you aren’t claiming that, are you?
If I was claiming that, then I would have said so. I am trying to correct the misunderstanding that some people have between something that is not normal (i.e. something that doesn’t happen that often: it snows in New York in August) and something that is unnatural (i.e. something that doesn’t occur within nature: elephants hunting gazelles).
A gay relationship is not normal in the sense that it happens in a minority of cases. But it is entirely natural. It goes without saying that either case has no bearing on whether it can be described as ‘good’ or ‘bad’.
Secondly, from a purely evolutionary perspective, it is difficult to understand why an orientation or behaviour that practically brings to a terminus the continuation of the genetic makeup of an individual is of any value for survival.
The answer is in the question. Evolution favours the survival of the particular species. It doesn’t work on an individual level. If the survival of our species was dependant on all couples being heterosexual and producing children, then there wouldn’t be any heterosexual couples who didn’t want children (just like animals in the wild have no choice in the matter) and no gay couples. But the survival of our species doesn’t depend on ALL couples being heterosexual and wanting kids.
You claimed: “…we are still left with the biological (evolutionary) knowledge that it is a bad idea. Not to mention the fact that we are brought up to consider it taboo.”
Likewise, with same sex orientation. We are left with the biological (evolutionary) knowledge that it is a bad idea because it terminates procreative possibilities, not to mention the fact that it is considered taboo in many (most) cultures outside of the secular modernist ones that exist today.
Having children that have something wrong with them (if close biological couples were allowed to have children) and perpetuating the problem (the problem gets worse as more related couples produce more children) is not a really good idea as far as the survival of the species is concerned. In fact, it would guarantee its demise.
The fact that some people don’t have children is no cause for concern as far as evolution is concerned. The lineage may die out, but it has no effect on overall population.
When the time comes for the first father and daughter to demand the right to marry, neither will say that a trust has been broken.
It has happened – and more than once. And I think that everyone would agree that trust had been broken in each case (assuming it didn’t match the step father scenario above).
Neither would two men who want to marry say that a trust has been broken.
May I use that as an example of a non-sequitur whenever I need to explain the term?