I believe that there can be well intentioned supportive people that can still be a bad influence. It is why I encourage christians to be the supportive person in the life of a transgender individual they know and relate to.
You're insinuating Christians can not be a bad influence. That assumption is absurd. Surely, even you as a Christian don't think all who claim to be Christians are on the right path.
If the person is seeking out that comfort with activists and some other members of the trans community, it is my opinion they are more likely to mutilate themselves than if they have the support of friends and family with good morals.
Another unspoken (and questionable) assumption: only those with bad morals would support a transition. We'll disagree on that.
If a person struggling with gender identity issues doesn't get that love from the people close to them, they'll get it from people in other communities.
Maybe, though I think there would be a strong correlation between suicide and the absence of support. Its not necessarily an either/or situation.