I thought it’s because it comforts, it’s like crying and like getting a psychotherapy. What if you have a reasonable point? Some internet Christian people seems to be against it. I thought it’s good to comfort a complaining person, even if you’re against him, you can explain why he’s wrong, in a gentle way if you’re a Christian.
If complaining is like protesting; Didn’t some Protestants protest? Didn’t some Catholics protest? Didn’t some right-wing Pagans protest? Doesn’t the courts of justice is there for complaints against a crime?
He supplies the needs of those who honor him; he hears their cries and saves them.
Are cries is like complaining? If it is; This shows that God has care for complains.
I know some complaining are overbearing or unreasonable, but not all complaints are like these.