Gay people can take a ciivil union and be happy or go back in the closet, marriage is a religious ceremony primarily and most religions frown on homosexuality. Personally, as long as they don't hit on me I'm fine.
There are certain situations that it should be allowed, but let's be frank, before Roe v Wade, it wasn't illegal. It just wasn't "On Demand". It was viewed as the highly dangerous medical procedure with questionable ends that it it. Now, it's an "On Demand" "right" to have an abortion. This is an alarming devaluing of human life in my, and many other peoples, opinion.
Most drugs are illegal for a reason. I assume you mean marijuana when you ask about drugs. I'll tell you that the concept of marijuana doesn't bother me any more than alcohol does. The problem is that, unlike alcohol which is a depressant, marijuana isn't a downer, it's a high and after a while people who use it on a regular basis start wondering what's available that is a bigger high, which leads to attempts to obtain much more lethal "highs" including cocaine and heroin. It is indirectly government's job to protect society from certain ills, because they are either unwilling or unable through lack of education or training to do it for themselves.