Because laws should matter. Laws should apply to members of government too. Unless you're suggesting it's totally fine for Trump and his administration to be above the law. In which case the whole discussion is moot, because then it's not a democracy with a functioning rule of law anymore.
Law is a tool, and some tools are appropriate for some contexts and others are not. Do you think there is such a thing as "International Law"? If so, I would ask you what you think that actually is and where its legitimacy comes from and who enforces it? Politics and Law are two separate spheres of human conflict. You actually degrade the law by trying to weaponize it for political purposes. I would hope the past 10 years have shown that to everyone.
