This is a hot topic right now, and this is the Ethics and Morality debate forum.
Yes.
For starters, this is a horrible analogy on so many levels. First and foremost, homosexuality is not an addiction. Secondly, for this analogy to even half work, you'd have to be "addicted" (and I use this term ever so lightly) before you even tried the drug. Thirdly, explain to me a "fatal" result of homosexuality that the same could not be said for heterosexuality.
No, we just try to point out that who we are isn't in itself "wrong". There is a big difference between that and trying to justify it.
Sure there is.
Homosexuality in itself doesn't hurt anyone. It's completely indifferent, and is certainly not an action that can harm. People can certainly hurt one another, be they gay or straight. Families may be distressed when they learn another family member is gay, sometimes for fear of their "eternal soul" and sometimes because they realize that a gay's life will be a hard one. However, these are things that can change when society as a whole comes to the realisation at which many of us gays have already arrived. The realisation is, of course, that gay people are just people - neither inherently good or bad - and are just another example of how beautiful and diverse human existence is.