There's a fundamental aspect of the issue that's missing in the article and in Obama's caution. Do you want to entertain the opinions of someone who advocates for policies that cause physical and emotional harm to others? Homophobia, racism, terrorism, white supremacy, Islamic supremacy, Hindu supremacy, are not "opinions" for discussion. These ideas are rooted in the evil disposition of supremacy/inferiority. Would any of you entertain a discussion from any white person that all brown people are worthless, should not be allowed into the US, and those here already should be sent back to where they came from?