Federal agents aren't executing people. This sort of hyperbole and misrepresentation does nothing to further the discussion. They aren't out there looking for people to gun down. You have thousands of people who are interfering with LE and Federal agents enforcing the laws enacted by a democratically elected congress... laws that aren't significantly different than those of most other countries in regards to their own immigration policies.
Now, if people disagree with those laws, that's fine. That's their right, but refusing to obey them because they disagree with them is not OK, and harassing and interfering with LE and federal agents lawfully enforcing those laws is absolutely not OK. Confronting the officers who are doing their job, harassing them, threatening them, assaulting them, and interfering with them doing their job is not only not OK, but is all but guaranteed to lead to a bad outcome. The protestors are in the wrong. Period. They are interfering with the lawful enforcement of federal laws. If they don't like those laws, they're free to attempt to change them by electing different lawmakers, but what they're doing now is unlawful, anarchic, and is the cause of all the violence and both shootings.