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Like I said two wrongs doesn't make a right, following the US path doesn't make PRC any better.
Besides US does not make outlandish claims like PRC based on "Ancestral or ancient claims" that can neither be proven or dis-proven, has no relevance in the modern world based on law.
If we're just talking about right or wrong, then I agree with you; two wrongs don't make a right. But, it's international politics and interests of great powers, where "right and wrong" often take backseats. Not good, and I wish it wasn't that way. However, we do live in the real world, and see it as it really is and not how we wish it is.
To be clear, I think PRC is the biggest impediment to peaceful resolution (I'm consistent in that view), not because it believes it fights for sovereignty claims, but because it refuses to state once and for all what it owns and what it doesn't own. The 9DL is ridiculously unclear and makes others think the worst- PRC thinks it owns 80% of the WATERS of the SCS. Ridiculous!