Judge not, lest ye be judged. I'm not going to tell them they're going to hell, that's not my job to tell them that, it's God's at the judgement bar. You cannot pass judgement, and neither can I. It is given to man, to judge what is right and wrong, for themselves, not for others. I've judged what is right for me, and that is as far as my right to judge, goes. So no, I'm not going to tell Mormons they're wrong, or they're going to hell. It's not my job to tell them.
Some people have been given the gift to spread God's word, and to not use that talent, is a waste, I agree. It's still not their place to say "you're going to hell", just because someone decided not to listen. Our God is a God of free agency, and to take that agency from someone, is a sin in itself. That's what got Lucifer cast out.
My gift, is not to spread God's word. I know what my gifts are, and I'm probably wasting them, that's true. Mostly because I don't know exactly how to use my creativity for that yet. I use my listening ear, and my empathy when the opportunity presents itself. Sharing opinions where they are not warranted, almost always breeds animosity. I'm a straightforward person, and when my opinion is asked for, I will give it without sugar coating it, and without any beating around the bush. I've helped many people with struggles, but only if my help is asked for. I don't appreciate people giving their opinions when I didn't ask for them, why would I do that to someone else?
Also, when a person asks for correction, it means they're willing to change, and that's what I wait for in a person. It's not my job to change people, it's God's job. God can send them my way, when He knows they're ready for my help. They ask for my help, and I give it. I can quote scriptures all day at a person, and I can give solid advice all day, but it doesn't help that person if they're not ready for that, and it doesn't help me or them, if they shut me down.
It's not my gift to be a missionary, I won't try.
My sphere of influence as it is, is something I'm okay with being held accountable for, because I know how large it is, and the people I've helped. I know I've helped God in the changing of lives that He needed changed. I've helped several people with severe depression. I've helped young women after being abused. I've helped young men, and young women with the addiction to pornography. The only way I'm losing my reward, is just being human, with my own struggles and sins.