Should Christians come out strongly against groups that do evil in Christ's name? I finally found a safe way to ask this question.  There is a Christian army called the Lords Army, that is doing evil in Africa, after twisting Christian teachings, yet this group is supported by some Americans, such as  Rush Limbaugh, and for those that want to read the transcript.

So, when a group is demonstrating very anti-Christian teachings while purporting to be Christian, I realize we can pray for them.  These people are evil, so how strongly should Christians not only try to stop these people, but then are we beholden to go into these regions to serve the people and try to show Christ's teachings, such as when he washed the feet of his apostles?

Other examples of people doing evil in Jesus' name would be subjective, but this group I hope is not.
There may be better or more applicable teachings, but this reminds me of Acts 4:32-5:11 wherein the Christians were living and sharing their things yet a couple was hording for themselves.  

Well, it didn't turn out too well for those folks, so if the LRA is as bad as it's purported to be, it won't turn out well for them etheir.  There's no basis for accepting acts of Christians who have proven themselves anti-Christian.

But, is it up to our church leaders to denounce them?  I think so to some extent, and to some extent they do. But pastors are often more concerned with their flock than ones half a world away. It's really up to us all to bring about the Kingdom of Heaven on Earth as best we can.  Run for office, vote for good people, give money to good charities, raise good children, there's more you can do if your vocation allows for it, but that's all most of us can do.