Yeah that could also portray Luke in a bad light, no matter what genuine reasons he had for abandoning her there. But it's also possible that he wasn't even aware of her existence as a child and it's the mother or someone related to her who took that decision of leaving her on Jakku.I don't like the fact that anyone in her family would think it's ok to be left on Jakku with Unkarr Platt, blobfish
Now I am more inclined towards the idea of Rey's parents being someone else all together, away from Skywalker.