In the U.S. we're not accustomed to thinking in terms of "security forces". That term is reserved for other nations, covering the gamut of police, intelligence, and military personnel. In the U.S., when someone is arrested or federal property must be protected, we speak of the specific responsible agency: the FBI, the Park Service, ICE, etc.
However, those agencies and all the others operated by the federal government, like the CIA (which legally cannot operate domestically), the NSA, and the forces under the jurisdiction of the Department of Defense, can be thought of as the "security forces" of the U.S. government — and right now, they all answer to our domestic Dear Leader. He can behave like the tinpot dictators he so adores because when literal push comes to literal shove, he can call on hundreds of thousands of members of the security forces to do the dirty work.
So I address myself to you members of those security forces, because you are in a difficult moral position.
I'm sure you tell yourselves that your job is to follow orders from your superiors. So long as you do that, you say to yourselves, you aren't morally or even legally responsible for your actions.
That only gets you so far, though.
Admittedly, you almost certainly don't have enough information to judge whether the person you're hustling into your SUV off a quiet street is actually a criminal, or even a threat. You assume your bosses — the whole chain of command, in fact — are acting in good faith.
However, you do have enough agency — that is, enough free will and moral responsibility — to judge how valid that assumption of your superiors' good faith is.
You don't live under a rock. Can you defend the deportation of Kilmar Armando Abrego Garcia, which even this administration admitted was an "administrative error"? Can you believe Trump's claim that his administration has no power to bring him back to the U.S., when this administration is paying El Salvador to hold prisoners there? Isn't it obvious that the president of El Salvador, Nayib Bukele, would have Abrego Garcia back on a plane to the U.S. in a heartbeat if Trump asked?
Given that Trump lies so brazenly about his ability to get Abrego Garcia back to the U.S., how much confidence can you have that he acts in good faith about, well, anything? How confident can you be that Abrego Garcia is an isolated "error", that there aren't more innocent victims?
Remember, too, that Abrego Garcia has been ordered returned to the U.S. by the U.S. Supreme Court so he can be given due process, which neither he nor anyone else deported to that El Salvadoran prison has gotten. In leaving Abrego Garcia to rot in El Salvador, Trump is defying the Supreme Court.
If he doesn't consider himself bound by the orders of the Supreme Court, then what constrains him? "The law" doesn't constrain a ruler if he claims the right to say what the law is, which is what Trump has done.
How is he different from a dictator?
Your orders ultimately derive from Trump's wishes. How confident can you be that what you're doing is consistent with the actual law, much less with morality and true justice, when the man at the top no longer respects any of those things?
Trump has claimed power for himself that no man has ever claimed in this country's history, because claiming it would be unconstitutional.
You swore an oath to the Constitution, not to any one man. Whatever problems you hoped to alleviate by becoming a sworn peace officer or member of the military, can you in good conscience be part of a regime that no longer respects or abides by the Constitution?
A regime that tolerates no dissent and uses you to crush it?
A regime whose security forces, including you, abduct people off the street without identifying themselves?
A regime that uses you to deport legal residents without trial? (Those people wouldn't comply if they weren't being held at the point of your gun.)
Only you can decide whether this is a regime you can support.
Only you can decide whether you can do more good by resigning now, or by resisting from within for as long as the regime allows.
Only you can decide whether you will be able to look your children and grandchildren in the eye, and tell them that you fulfilled your Constitutional oath by following the orders of a man who betrayed his own, and know whether you're telling them the truth.
You cannot avoid making this decision every day you help to keep the regime in power.
If enough of you honor your oaths and your consciences, you can render a lawless, faithless president impotent to subvert the consitutional order further.
You are not solely responsible for restoring that constitutional order: we all have a part to play. But you will be singularly responsible if you help this lawless, faithless president to become a tyrant, ending our republic.