You go through the legal process to make sure you have all the rights of being here legally and don't have to continue worrying about it. That doesn't mean someone who's status changes over time should be detained and deported simply because they're no longer here legally or their legality is in dispute. There are other ways to handle it.
Why be outraged at someone else's status? People migrate for all sorts of reasons.
Someone who came to the U.S. from a first world country on a 90-day visa waiver meant for tourism and business trips should be immediately deported if they overstay their visa. It’s actually the clearest case for deportation there is.
And you should be outraged at people who don’t follow the rules. One of the things that makes America a first world country is that cutting in line is considered a crime against society and carries heavy social consequences. Saying “don’t make noise when you see other people breaking the rules” is the mentality that exists in the third world country I’m from and it has no place in the U.S.
Why be outraged at someone else's status? People migrate for all sorts of reasons.