The reason why I said you haven't been paying attention, is because almost everything the Trump administration has been trying to do, keeps getting blocked by the court. And contrary to popular belief, that matters, even if the Trump administration isn't following every ruling. Those count as crimes, and there will be a reckoning.
But that all goes into the pile of stuff we can't "prevent", because you can't prevent them from committing crimes. You can hold them accountable for them, though...but unfortunately it's after-the-fact, and the process takes time.
You may be right though, about the actual individuals who murdered Renee Good and Alex Pretti. They may get off. But I highly doubt Kristy Noem and Stephen Miller will. Or even Greg Bovino. The people responsible for the policies that led to those murders will be held accountable. But again, unfortunately it will be after-the-fact, and it will take time. And you are correct...it will take a change in leadership. Because you're also right that the Trump administration won't hold them accountable.
But none of that makes the system broken. It just means that Trump and most of his cabinet are guilty of breaking the law. And if we don't all stand up and do something about it, then they will get away with it. The best and easiest way to make sure they are held accountable, is to show up for your midterm elections, and make sure Republicans lose their majorities in both Houses.