Well, let's analyze the situation. I think that a gentle person should have no trouble with honesty. Indeed, statements are not intrinsically harsh. They are harsh because of the value judgments we fear from others, but not just that, also the rewards we've come to attach to those value judgments (ie you have to care about someone's mockery to really be affected).
Of course, you need to be careful, as you may be gentle, but the world has probably not been, so unless the person feels especially protected, he/she may feel unable to deal with the world if you destroy their sense of how things are. So gentleness would be fine if one merely wanted to prevent someone who never was traumatized from getting so. But someone who already was traumatized needs to feel there's a way out, needs to regain faith.
Of course, you need to be careful, as you may be gentle, but the world has probably not been, so unless the person feels especially protected, he/she may feel unable to deal with the world if you destroy their sense of how things are. So gentleness would be fine if one merely wanted to prevent someone who never was traumatized from getting so. But someone who already was traumatized needs to feel there's a way out, needs to regain faith.