So you will then have Beijing telling civilians to evacuate and DPP telling them to stay. When they inevitably get dusted, the DPP will be to blame, and everyone on Taiwan will be fearful of listening to their continued commands.
Plays right into what China needs in order to secure lasting peace.
Who will condemn China that matters? Putin, who maintains China's raw resources and oil, will say bombing insurgents is too evil? Or maybe Iran, our reserve oil area, believes its unacceptable? Or all the 3rd world countries who voted against US in every single UN issue?
There are extremely easy solutions. Give the civilians early warning of a few hours or minutes and then flatten the whole block. It teaches quickly to locals that you should under no circumstances listen to the rebel authorities, but only to the central government, and it shows the whole world tangible proof of China's victory over American invaders.
Lesson from Ukraine war: Washington cronies can write whatever they want on their blogs et al. And it has no effect on real life! They can say we create mass graves in Taiwan province, whether this is true or not, no Chinese or others who matter will care.
You split the KMT resistence fighters from the civilians who would support them.
Taiwan is a closed system, like Gaza. Drawing from the recent ME conflict, the actual point of failure for the Israelis is that 6000 munitions over the course of 1 week is grossly insufficient to actually force out enough civilians. Additionally, the terrible reputation of Tel Aviv makes civilians unlikely to use the evacuation routes proposed by the IDF.
China will not face these problems, if they set a much higher target for bombs released, and they have better "goodwill" with the locals inside the province as well. Palestinians are used to having shelters and being bombed. They trust Hamas because Hamas historically provide safety. Taiwanese are not used to being bombed at all, and the local resistence has no experience in saving civilians from government air raids. When you give Taiwanese the ultimatum, they'll listen to the central government 9/10 times, and the remaining 1 person will quickly demonstrate why not listening was a bad idea...
These are good points. Its interesting to wonder how the scenario would look like when the PLA warns Taiwanese civilians in an area to evac before an incoming strike. If the civilians received the warning, chances are, the military would receive it too, and evac together. A HIMARS launcher could be quickly packed up and driven among the crowd of escaping civilian traffic. The PLA could warn civilians to stay away from that HIMARS launcher no matter where it goes. Then, any unfortunate civilians or idiots who continued to stay too close to that HIMARS gets liquidated along with it. Sooner or later, any Taiwanese HIMARS is gonna become a figure of fear, rather than a symbol of defiance against the PLA. Sober civilians are gonna avoid it like the plague, rather than climbing on it and waving flags to encourage the crew.
So how should the PLA get their targeting message across to Taiwanese civilians?
1) Internet is the best method, but could be subjected to DPP censorship. And if the PLA allows Taiwanese internet connections to persist, it could act as a double-edged sword.
2) TV and Radio broadcast could be useful, but they could be jammed and blocked by the DPP. Furthermore, traditional TV and radio don't have the same reach as they once did before the age of 4G internet. Again, allowing Taiwanese media communication to persist is a double-edged sword.
3) Drones with communication relays or loudspeakers could be used. But they still run the risk of interception by the enemy.
4) Leaflet drops are very old fashioned. They are logistically demanding, and can't deliver the message fast enough. They still need munitions and assets to deliver them.
5) "Roof knocking" like what was practiced by the Israelis? Its true effectiveness in saving civilian lives is very questionable.
6) Marking the target with flares, beacons, or lasers could work. But it'll also expose the target designator to enemy return fire.
Are there even better methods to send the message across?