What a story. And you are right, I have had a couple of friends fall away from the church, and it was with good intentions that they tried to open others' eyes to some failings of others in the church, which to me was very judgemental. Eventually it turned to rabid hatred of anything to do with the LDS church and they are actively working to turn us from our deluded ways. It is very sad. And unfortunately they are former friends for two reasons. The first one was that was all we talked about was religion, them to bash, me to defend and try to reason. And then it got to the point where I had such horrible feelings after being with them. And then they cut off all contact.
and it was with good intentions that they tried to open others' eyes to some failings of others in the church, which to me was very judgemental. From my experience, if someone leaves the church because they don't understand the gosple and didn't have a testemony, they don't invest their time and effort in pulling other people out, they go on with their lives and have no axe to grind.
On the other hand, people who leave because their pride is more important to them than the truth, and who did have a testemony that it was true, are driven to rail against the church and pull as many out with them as they can so they can point to the ones they pulled out in a vain attempt to justifiy to themselves what they did. They want validation for their deeds that deep down they know are wrong.
Of course there are exceptions to this....