I suspected that it's about immigration agents. But it's just really funny how the article claims to explain the issues, without actually explaining it.

Why do they use weapons extensively? Are they chasing violent people who shot at them earlier, or just for fun? It just raises more questions, and doesn't help understanding the situation at all.

They use weapons extensively because they're overwhelmingly barely physically capable of the role (https://www.newsweek.com/dhs-responds-report-ice-recruits-fa...) and get 8 weeks of training with no military or law enforcement experience required (https://old.reddit.com/r/ICE_Raids/comments/1mrdh6r/fyi_ice_...).

You can read any mainstream source to find out the general contours of the situation. The "want you to understand" is in the context of there being too many people in outright denial about the naked autocratic fascism that has descended upon our country - eg see all the comments in this very thread trying to justify any of this as being about "the law" or "illegal immigration".