The only response the entire West was able to give in years of Chinese transgressions were strong words, about as effective as "thoughts and prayers". China is a bully that escalates continuously (similar to Russia's behavior in Syria with the countless "red lines" that were crossed, eventually including chemical weapons) and needs to be brought to its knees before they one day trigger WW3 by accident.
[1] https://www.reuters.com/world/asia-pacific/chinese-coast-gua...
[2] https://maritime-executive.com/article/philippine-official-a...
This is what one would do to a school yard bully. They push you, and you immediately do a full face punch and knee to the nose. Fight to the death from the first push/shove, and let it escalate. One fight, and the bullying is over, or you both get injured sufficiently to go to the hospital. There should be no middle grounds.
That this is not as big a deal as you think was the reason for my grandparent post. The "US citizens wary" thing can reverse itself the moment Americans are killed by a hostile adversary.
American Secretary of Defense: "Mr. President, the Chinese just destroyed our Naval base in the Philippines, killing hundreds of US servicemen. As part of a plan to annex the country or something."
American president: "Let's not intervene too much."