I actually like Melisandre & root for her. She wants to save the realm, just like Varys, and thinks the Lord of Light is the way to do it. In her mind, what’s the burning of a few people/children, if she can save the world? Unfortunately, the visions the Lord sends aren’t always clear :)
Plus, it’s not like Dany isn’t going to be roasting a good number of Westerosi this season…but she’ll use Dragons, so it’ll be COOL!