I really wish independent journalism existed so you could find out basic facts like "how often does the FBI normally arrest judges?" "Has a judge ever been arrested for obstruction of justice?" "Do they never get arrested inside a courthouse?"
I'm sure Judges sometimes commit crimes, just like everyone else. Are they normally given special deference and not arrested? Do they only get arrested for serious charges, and normally they get special dispensation because of their judge status?
Arresting judges does sound alarming, but without context it's impossible to know just how norm-breaking it is.
For example, if a judge is pulled over and found to be driving drunk, I most definitely would want that judge arrested and charged. Not arresting and charging a judge in that situation sounds like institutional corruption. I wouldn't be surprised if it happens, but I don't know because these journalists aren't doing their damn jobs.
Don't get me wrong, in this case I'm pretty convinced that the Trump people are overstepping their bounds. It seems like a pattern of attacking the judiciary. And, this isn't the judges being arrested for driving drunk or accepting bribes. This is judges being arrested for things related to immigration. Immigration, in particular, is something that the Trump administration is doing completely unlawfully.
But, how can we have any kind of informed dialogue when the standard of reporting is: "One side said 'It's outrageous they arrested a judge', the other side said 'the administration won't accept judges breaking the law.' The judge may have been a democrat."