Um, Why is CW Whitewashing Sin Lance in ARROW?

So I just realized that the casting of Sin Lance in the second season of Arrow is not right. If you read Green Arrow or Birds of Prey, you will notice that Sin Lance is Asian.

See here, Sin is the young girl

And this is the actress who is playing her

Bex Taylor-Klaus

Now I don't mean no harm, but she doesn't have a lick of Asian in her.

In this day and age, CW should have known better. Why not keep Sin the way she was meant to be? And would they not think fans wouldn't say anything about this?

This is not a good look, CW. Please be aware of your actions with this casting.