This reply doesn't address any core point.
When these wind farms were permitted many years ago, shipborne drones were not part of the threat matrix. It was considered purely hypothetical even a decade ago because it was not an imminent capability for any country even though e.g. the US DoD had studied it. In the last few years shipborne drones have emerged very quickly as a substantial practical threat, largely due to the Russia/Ukraine war. Governments around the world are struggling to adapt to this new reality because none of their naval systems are designed under this assumption.
Whether or not this is convenient for Trump doesn't take away from the reality of the security implications.
Yes, it does.
First of all: occam's razor. Political theatrics seems simpler than the US defence/intelligence forces sudenly realizing that drones can be launched from ships. Esp. with the timing involved.
Second: Established/traditional radar systems cannot spot drones. Take it from someone living in a country that recently had its airspace violated by (assumingly) Russian drones, affecting national infrastructure. It was considered an attack at the time. I don’t think thats the word we use any more, for political reasons.
Third: Trump already shut down one of these windmill farms once this year. Until the danish company building the park sued and got the courts word that the shutdown was illegal, and resumed construction. The current shutdown has much larger impact for many multi-national companies. Usually there is a political process expected between allied countries before such a drastisc move. We havnt seen that ie no attempt to solve a concrete (security) issue before punching the red button ie probably because there was no motivation for a solution ie the security issue was probably not an actual issue)
Fourth: Earlier this week the danish intelligence services released a new security assesment of USA (that takes Trumps behaviour on the international scene into account). That probably hurt the little mans ego, and now we see a retaliation. This provides yet another motivation for Trumps action, besides factual, real security concerns.
Looking at this purely from the security aspect is naive, and fails to consider the context of the real world.