When I was an active JW, a sister in my Hall needed support. Her daughter was the target of slander and it was affecting my friend. So I stayed with her, I listened to her, I would read back Bible counsel about endurance through trials and focusing on Jesus and not the congregation.
An elder decided she was weak. He said I should not associate with her. That scared me. What if I had a trial? Would the congregation abandon me? Well, I found out soon enough. But anyway, the discussion led to my questioning this elder about "marking" in the congregation. I told him I understood about protecting ourselves from "unwholesome influences" but what if someone were suicidal? What if in my head I was thinking, "gee, this sister is getting me down, I'd better run." But the battle of conscience says as a human being I have a DUTY to stay with that person lest they harm themselves. He coldly replied, "well, what are ya gonna do, commit suicide with them?" I couldn't think he could've said anything more anti-Christ.
In my mind support overrides protecting your own ass and getting yourself heard. And that was the beginning of the elders watching me. I was rebellious for showing support.
Support changes with each situation and each individual. Sometimes support does indeed require a good slap in the face. But when it's obvious someone is frail and at the end of their rope, it's time to curb yourself. Curbing yourself may involve not saying anything at all, it may involve just being the sounding board for the person's frustrations, but when it's clear they're not strong enough for a slap, you need to be the stronger one and just let them lean a while.