Honestly, with Ukraine already providing an example to the world, such terror attacks against buildings, public facilities and infrastructures in China is indeed a legit concern for the mainland Chinese authorities.
There is something WRT to this which I would like to bring up from Liu Xiaofei (and Fu Qianshao as well) from late September last year (2021), of which the video is linked below (only in Mandarin Chinese):
For those who don't understand Mandarin Chinese - In short, someone on a well-known Taiwanese internet forum (PTT forum) posted a question thread on
how many fully-fueled civilian jetliners would be required to ram and collapse the Shanghai Tower (currently the tallest building in China).
View attachment 99095
Pictured: Shanghai Tower.
The Taiwanese PTT thread poster even went into the details on the structure and method of construction of the Shanghai Tower, plus comparing it to the twin towers of the old World Trade Center in New York, civilian jetliner models in use by Taiwanese airlines, etc. The discussion that followed alarmed many people that even police reports were filed because of this. Why? Because the discussion on the forum did bear similarity to how al-Qaeda's Osama Bin Laden planned the September 11 attacks, considering that Bin Laden has a civil engineering background.
In retrospect, the Taiwanese PTT thread poster is suggesting
a Chinese version of the September 11 attacks.
View attachment 99096
However,
this isn't the first time that topics and suggestions for conducting terrorist attacks against China have been brought up by Taiwanese separatist extremists. Others buildings and infrastructures in China that popped up in those kinds of topics and suggestions throughout the past few decades include the
Shanghai Jinmao Tower, the Pearl River Delta Bridge and the
Three Gorges Dam.
In essense,
the possibility of Taiwanese separatist extremists looking into the option of waging terrorist attacks against Chinese civilians must never be disregarded.
Therefore, the recent attack on the Crimea Bridge
should ring loud enough alarm bells for China with regards to the
safeguarding and protecting the Chinese homeland and her people, especially the regions along her coastline and several hundred kilometers inland that are closer to Taiwan island where hundreds of millions of Chinese people resides.
In case of ultra-hightened tensions and/or AR scenario of Taiwan island, the PLA, PAP, People's Militia and relevant security agencies and departments of the Chinese government
must be put on full alert and
be prepared to respond to any contigencies in order to
protect Chinese civilians from any potential terrorist attacks by extremist separatists based on Taiwan island.