Let me interject with a few observations:
Considering the LA riots of 1992 after the Rodney King arrest, if there is one city in the US where the cops know the difference between riots and a demonstration leading to some excesses, it is LA. And, from what I can see on the news, the cops in riot gear and plain uniform who are actually dealing with the excesses do appear to be LA city cops. One car or the contents of one garbage can set on fire in the middle of the street do not a riot make.
Second, while I have no problem with the usually plainclothes police officer who are the infiltrators wearing masks when a drug bust goes down, so they can continue their undercover work in the future, such niceties do not apply to ICE personnel, who have no reason to show up dressed as if they were special force and hiding their faces. This is pure and simple terror tactics on the part of the government. One of the most important right (I was going to say of an Englishman

) in common law is the right of a citizen to know exactly who the state agent interfering with his/her freedom to peacefully go about their business so that agent can be dealt with should he/she breaks the rules of propriety. Put simply, in common law (which applies in the USA), LEO have no right to hide their identity except in very limited and specific circumstances.
Finally, while I can see dangerous criminals putting up a fight against LEO, when dealing with simple immigrants going about their work to just try to earn a living, we all know that 99.9% of them willfully comply with the indications of the LEO and don't put up any fight. In raiding a Walmart (or what have you) you were not dealing with hard criminals, but with the second category. To show up with the look and the equivalent of a Company of soldiers dressed for combat, you are both provoking and terrorizing - and lets face it, that was the objective, and this further use of the National Guard is meant to increase that feeling of terror. It is unfortunate that unleashing LEO's from the legal bounds that restricts them always seem to entice a certain number of them to let their prejudices and warped view percolate to the surface in their interaction with the public.
Considering the number of immigrants - legal or illegal - that simply want to live in peace and earn a living in the USA, and the number of people who rely (some would say in some case, abuse) on them, there is now a real reign of terror going on in the US. I suggest they look at how things developed in other countries where such methods have been used.
If Americans are blind to this, I believe they will pay dearly for the lesson by the time they right the course.