Failing to criticize our national governments simply because others do worse guarantees a slow creep towards that worse behaviour because anything less is, by your reasoning, acceptable. The fact that Iran, Burma, and China engage in broader and more extensive internet control and suppression doesn't make the ICE domain seizures more acceptable or infringe freedoms any less.
Further, I personally believe that we have a greater obligation to ensure our home country is abiding by the principals we want other countries to. Not only does it clear us of hypocrisy (see US on torture and prisons) when attempting to convince other countries to reform their practices, it provides a clear example that it can be done without catastrophic consequences (assuming they don't see our culture itself being a catastrophe), and is how our government is structured to function. Limiting our scope to local issues is often a matter of conserving our efforts and avoiding tilting at windmills. I can't personally stop hunger in Africa but I can ensure my neighbours get invited over for dinner frequently because I know that the adults in their house frequently miss meals to ensure that their kids always get fed. The same principle applies to world affairs - I can make real (though small) changes in the US but ignoring them because China is worse leaves the entire world a worse place.