They object to three things.
Firstly, who is being deported - that is, family men and women, workers at menial jobs, those men and women who are washing your dirty dishes out the back of your local restaurant, 12 hours a day for minimum wage. People who are sometimes in the process of applying for citizenship. When it was promised to you by Trump that they'd be concentrating on the real bad guys first. Well, he lied to you. Which really can't be too much of a surprise to you, now can it..?
Secondly, the lack of due process. The complete and wilful ignoring of the constitution.
Thirdly, the complete over-the-top means by which some ICE officers are going all this. Body armour, flash-bangs, military style weapons...it's not required to check the bona fides of someone washing dishes or sewing clothes. Not to mention that now we have the National Guard involved and Marines are being bussed in. You kidding me? Marines? How over-the-bloody-top can you actually get?
And all this is being ignored by so many. All they want to do (and you've been doing it) is pointing out some morons who torch some cars and throw some rocks. Which is exactly what Trump wants you to do! Oh no, someone spat at a cop. Oh no, someone threw a rock. Oh gosh, someone burnt a flag.
Ye gods, it's like you're complaining about the soup being cold as the Titanic slides under the waves. Wake up to the reality of what is happening in your country.