I don't fully support what my country (China) do in South China Sea but there is a critical context: around 2011, then Secretary of State Hillary Clinton basically announced in that US would do whatever she liked in Strait Malacca if necessary. Her announcement scared sh*t of lots of people, especially amongst leadership in China.

I understand people normally project their countries as the major source of good. Sadly it's not the case for both US and China.