A necessary step to reduce risk to infrastructure given that the US government has become erratic and has decided it is now anti-Europe. The US means to undermine the EU: https://www.dw.com/en/will-trump-pull-italy-austria-poland-h... The US means to annex European territory: https://www.bbc.com/news/articles/c0j9l08902eo It's the same reason you don't want Chinese equipment in your telecommunications infrastructure.…
It's not clear that europe even trusts europe anymore. Especially with french and german economic dominance looking shakier than ever, debt financing an unpopular war in the east piling up, mounting deficits, industry collapse, youth unemployment... european countries (or greenland for that matter) could do a whole lot worse than turning to china.
Agreed, though, that reliance on US is foolhardy. I can't make any sense of why we're trying to saw the feet off our own economy.