[提問] 主動清除太空垃圾的技術威脅程度如何？

看到一篇報導說到，
去年中國已經超越俄羅斯成為第二大太空強權。
擁有的軍事衛星數量也可能已經比美國多

https://breakingdefense.com/2023/01/china-tops-us-in-defense-related-satellites-orbited-in-2022-report/

China tops US in defense-related satellites orbited in 2022

The US attempted 78 launches in 2022, with 72 of them successful, according
to the report published Tuesday. Russia successfully launched 21. China
attempted to launch 64, and 62 made orbit. For each country, many of those
launches carried multiple satellites. For specifically defense-related
satellites, the report finds that China orbited 45, the US 30 and Russia 15.

其中有一段特別提到中國去年發射的實踐21號衛星，
是第一次主動清除地球同步軌道上的太空垃圾成功。

China also became the first country to successfully move a dead satellite outof the way of active satellites in January 2022, the report said, when it
used its Shi Jian 21 (SJ-21) spacecraft to capture a failed BeiDou 2-G2
navigation satellite from geosynchronous orbit (GEO) and drag it to a higher
“graveyard orbit.”

“This is the first case of actual active debris removal from GEO. It was
expected that SJ-21 might repeat the exercise with another satellite。

有些報導認為這個技術可以轉做軍事用途。

https://technews.tw/2022/01/28/china-sj21-satellite-captured-old-beidou-positioning-satellite-and-throw-it-to-the-graveyard-orbit-which-caused-worries-among-us-space-force/

https://tinyurl.com/neur2pm2

想請問一下版友，比起用飛彈直接把衛星打下來，
這樣的技術有什麼優點嗎？為什麼會會引起警戒呢？

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瞭解，不過這好像不是回收而是推到另一個軌道 另外請問 戰爭時這樣做有優勢嗎？

美國應該是本來就有在開發這樣的技術。

只是中文那篇寫說美國目前技術落後於中國， 我就不清楚出處是哪裡了。