There are plenty of countries in the world where gays can marry:
- Netherlands (one of the few things we did right, historically)
- Belgium
- Spain
- Canada
- South Africa
- Norway
- Sweden
Coming soon:
- Nepal
(from the wikipedia article).
So, Homosexual marriage is an oxymoron only in those places that don't allow it, and in those places that do allow it there have been no major outbreaks of anything to date, so stop being so afraid, live and let live.
Being able to marry the one you love is an essential part of the freedoms that should be accorded all human beings, including those that love others of the same sex as their own.