It's about changing ideas of what's acceptable in society. Beastiality, pedophilia, etc. may not be acceptable to you, but who's to say they won't be in the future; just like gay marriage is acceptable to some now? Nobody is saying it will happen overnight. It's a very gradual process, from the brightest white to the darkest black.
How dare you throw all issues together? If you are ever going for bestiality, you'd have me and PETA on your case. If you ever dare go for pedophilia, you can bet you'd have me on your throat. There's no way you could mix acts of consenting adults with raping of children and animals. I can't believe we have to remind you this over and over again.
