allowed to flow into contexts for which it was not designed."
Let's take them one at a time.
First, sex is easy. Natural reason tells us that sexual activity is oriented to and leads to procreation and that marriage naturally is the best context for procreation to occur. A child is best off with its biological parents. So it is hardly surprising that every culture has some form of marriage based on the mother-father-child triangle. Sex belongs in marriage and every serious form of natural law or religious morality affirms this conclusion. But sex outside marriage is destructive of personal communion, social stability and children.
So we have in human sexuality a very good thing as long as it remains in its proper context. Yet that very good thing can become perverted, twisted and destructive as soon as it bursts its channels and floods into promiscuity or adultery.
Second, socialism is in many ways a high and noble ideal. As practiced by small, disciplined, voluntary communities, for example, monastic ones, it can be a good way of life. Socialism is not bad except when it bursts its natural bonds and becomes an ideology which is imposed by coercion on society as a whole. I would go so far as to say that coercive socialism is as bad as coercive sex.
Socialism is utopian in the sense that it is incompatible with the fact of original sin. The reason that socialism always leads to tyranny, poverty and atheism in this world is because of the tragic flaw in human nature - not because of the idea of socialism itself. As an idea, it is wonderful. But when implemented in a society of fallen sinners, it becomes horribly destructive.
Third, pacifism is also in many ways a high and noble ideal. As practiced by small, disciplined, voluntary communities, for example, the Amish or monastic orders, it can be a good way of life. Pacifism is not bad except when it bursts its natural bonds and becomes an ideology which is imposed by coercion on society as a whole. I would go so far as to say that coercive pacifism (i.e. the government adopting a pacifist stance on behalf of a population containing both pacifists and non-pacifists) is as bad as coercive sex or coercive socialism.
I call pacifism for modern nation states "liberal pacifism" to distinguish it from the vocational pacifism which has taken various forms in the history of the church. Twentieth century liberal pacifism is rooted in liberal Protestant theology, which is to say that it is Pelagian and Progressive in its character. This kind of pacifism makes war more likely because it encourages Christian countries to disarm and not practice deterrence and it corrupts theology by highlighting the worst features of heretical understandings of human nature and history. It even reconstitutes the doctrine of God by denying Divine wrath and judgment in the name of defining God by means of the abstract principle of non-violence supposedly derived from Jesus.
One other feature that all three of these things have in common is that they are all highly attractive to sentimentalists. All have an enticing, naivety about them that draws us to them as ideals. We see the pull of the passions at work in sex and often tragic results flow from naive young girls mistaking aggressive lust for romantic commitment in their boyfriends. Yet, I for one, would not want completely to reject or condemn romance.
Socialism and pacifism are romantic notions that, like sex, make one feel good. That is the secret of their attractiveness. Affirming pacifism and socialism, especially in the exuberance of adolescence, is like a drug that makes one feel pure, innocent, superior and at one with all things. It is a substitute for genuine love for mankind, which is always tempered with a realistic assessment of human nature and the limits of human and social perfectibility in this fallen world.
Real love sometimes disciplines, sometimes challenges, sometimes rebukes and sometimes accepts despite the on-going flaws in the beloved. Sentimentalism wants everything to be perfect all the time and is devastated by failure to live up to the highest ideals one can imagine. For this reason, it tends to be destructive of personal relationships and social bonds.
All of this is to say that love is opposed to sex, socialism and pacifism whenever they overflow their banks and escape the boundaries meant to contain them.
Am I against socialism, pacifism and sex? No, as long as they remain in voluntary, limited, contexts and are not imposed on others without consent. I affirm them as goods but recognize that all evil is the perversion of and lack of the good.