One kind of pushing your hands against your ears is ignoring problems that other people are talking about when you're not comfortable with hearing about them.
Another form is being so insecure about your identity and politics that you can't talk about real-world problems anymore. DHH will never see the forest through the trees if he lives in fear of being called a Nazi by someone who can substantiate the claim.
Making immigration illegal, makes immigration a problem.
Making immigration legal and pursuing integration makes immigration not a problem.
That's why so many countries have problems with immigration: they don't integrate.