It doesn't matter what a person of a different religion or belief says if it's not your own because it has no authority or validity to it.
I think the "It Gets Better" campaign is a little bit irresponsible because dealing with being gay may mean that it doesn't get better and one has to accept that certain things are not going to be the same. Getting better might mean having to accept and deal with changes that one doesn't want to happen or that one fears will happen. This is what people need to be taught how to deal with.
What some people who are suicidally depressed about may not be something that will change for the better or at least for a very long time. They need to learn how to deal with that, that it may not actually get better in that regard or in certain ways they would like or want. That to me is being responsible and caring, not just saying it gets better when you don't even know a person's situation and I think hearing that kind of message from people who have gotten better is in some ways can be demeaning or patronizing to a person and their own situation.