Why?
They're literally based there, and they're building - and repairing - infrastructure. Like,
one, and there are many similar news.
The Philippines are certainly within the range of their maneuver, both from the west (Wake - with refuel) and especially south (Darwin - direct F-35 flight, no problem). Carriers&LHDs can do that and more.
And while USAF isn't magic - they're the World's strongest air force, supported by world's third tactical force(navair) and another one in the top 5(marine air). That's a lot of magic.
China is their stated enemy number 1, Philippines is the best place to contain and fight China(and also the weakest if not reinforced).
If this is SCS strategy thread - this is a subject to talk about, not winning water cannon battles against a weak proxy.
There is a force behind all this, and this force has existing or potential basing options around all the SCS.
Calming yourself with the words 'they won't dare' is no solution.
No, but they are small and fixed - so they can be suppressed (both directly and through interdiction), and their capacity isn't exactly endless.
Safe and survivable Chinese airbases with secure supplies are much further behind, at least in Hainan. Landmass and population around matter.
They are disposable. But to dispose of them you'll have to control Phillipino land mass, or they'll continue to be a threat.
Very big and annoying threat, requiring disproportional resources for backyard security - and there will be leakers nonetheless.
Why? Sustain several dispersed HIMARS/NMESIS batteries, refurbish airbases and rotate air contingents to keep them familiar with theater.
This costs pennies, and this is already more offensive capability than the whole Wanwan. Worse - it paves the way for more, much more.
If US air deploys here in force - they can at very least contest against PLAAF&strike into China in force due to proximity, it potentially allows USN
surface units to enter SCS and Luzon strait in force. This, in turn, at best means China is firmly contained to 1st IC unless it can defeat US military in frontal fighting, at worst it means partial paralysis of Chinese mainland economy.
Like, at this point consequences are so dire that it's simply cheaper to invade the bloody islands before they're full of US.
TLDR: if you aren't willing to accept that Philippines made their choice and you don't want to be able to solve it - the enemy will do it for you, and you will not like it.
And what's the point of huge investment into a mobile force - i.e. navy - if you don't want to use it even when threatened.
Please spare me the peaceful character of Chinese people, victor will make sure to write you into demons in human flesh.