From a “scientific” point of view (the quotes are because it’s hard, at times, to disentangle science from ideology), the verdict on the “causes” of homosexual behaviour is far from clear at the moment.
Neither a purely genetic nor a purely environmental model seems to fit the bill, and neither armchair genetics (“the gay gene”) or armchair Freudianism (“his mother dominated him”) are very helpful explanations.
I prefer to look at an analogy with a much less grave, but scientifically similar problem: alcoholism.
We do know that a tendency to alcoholism can be genetically determined, at least in part.
We also do know that environmental factors (such as being exposed to drinking behaviour early in life, advertising, easy access. social pressure) play a key role in determining who actually succumbs.
But even once a person becomes dependent on alcohol (i.e., becomes an “alcoholic”), recovery includes not just a medical dimension, but a moral (I would even say penitential) dimension.
Even the best psychiatrists and psychologists admit that unless an alcoholic is ready and willing to change, treatments (either drugs or therapy) do not work too well. Certainly, people can be supported and guided along the process of deciding to change, but that is never enough. Even Alcoholics Anonymous tacitly accepts this when it alludes to a “Higher Power” helping alcoholics to quit. (For us Catholics, there’s little doubt about Who that “Higher Power” really is!)
Like a tendency to alcohol use, a tendency to homosexual behaviour is a cross that some men and women have to bear. They deserve our sympathy and understanding, but NOT unconditional acceptance or encouragement to sin.
If I’m a taxi driver and an alcoholic, my employer has the right to fire or suspend me, because I am endangering the lives of others.
Similarly, if I am living an openly homosexual lifestyle, a school (or an adoption agency) would have the right to fire me (or prevent me from adopting) because my lifestyle and behaviour could be a cause of falling and sin to my students (or the child I would have “adopted”). A distorted, commercialized, sentimental concept of “love” has nothing to do with it. Love wants what is good for God and one’s neighbour; it’s not a question of putting my needs or desires first.
And as for Governments ruling in favour of it, I’m sure St. Pius X would have a few words to say about this: he condemned the Modernist notion of a complete separation between Church and State.
Finally (though I know I will sound pedantic here), could we please avoid using the word “psychotic” here too loosely? I know it’s being used metaphorically, but to me, psychosis is a technical term for various severe mental illnesses (schizophrenia and related disorders) that I deal with almost daily…and seeing it used otherwise is a bit jarring.