I think the point being made is that you can create your own enemies. In this case, meaning enemies of the United States or politics of the United States. Many of the radicals of the world become that way due to harm that became them or their family.

If your family lived in a village in middle east and the military of another country came and seemingly killed your parents, you would think that the person would grow to have certain opinions on the things and certain enemies.

A lot of the policies being enacted have the potential to create a lot of enemies. Just to name a few, there have been thousands of people fired from federal government. Those people and their families have had their lives changed. You have people from other countries who have lived here their entire lives who are now being separated and sent to other countries. You have people playing politics with Ukraine where many people are dying due to something that the rest of the world has the power to solve. Or people in Palestine being murdered while some talk of building a wealthy paradise on the land where they were raised.

I'm not taking a side on these things. But you have to agree that these tactics have the habit of making very determined and malicious enemies. Many political policies, and the people who have strong opinions on them, have to realize that their opinions and the policies they support, do impact the lives of real people. Potentially causing devastating repercussions, death and suffering. If said people are determined to enact revenge, it is no surprise that feel justified in doing so.

I'm not justifying their thoughts or actions. But you can understand that people who have felt these impacts aren't acting particularly rationally or are stable.