If your policies are correct and reasonable, and the "right wing guests" aren't reasonable, you don't need to worry that they have a platform.

If you try to block people from hearing opposing points of view, even if you're guiding them to what's correct, you're hurting their ability to learn to sort out the good from the bad, so longterm probably making it worse, and creating a further dependency on the right people telling them what to think.

If you're secure and comfortable in your beliefs I don't think you need to worry that the opposition gets heard. (You should actually want them to.)