Neighbor's tree - Security and dirt. Who is responsible?

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And now to the people who like to complain...
Just stop it!
I started a thread with this topic to get advice/help on how I can proceed or what the situation looks like.
I really don't need an assessment of my fence, the pallets, or anything else.
The thread is only about these trees. If you want to comment on that, go ahead.
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Such a thing can (unfortunately) happen when a thread gets 'out of control' due to a lack of moderation by a OP ;)

Speculation, assumptions, guesses... One thing leads to another and always further away from the actual problem.

The information that the trees have been declared dead and dangerous by an expert completely changes the premise for an answer.

If someone comes and demands the felling of living trees because they consider them dangerous for their child and dislike leaves and needles, that creates a completely different context (both in terms of content and human perspective) than if someone comes and points out the removal of dead and dangerous trees.

I also find such fir trees incredibly ugly and outdated. I have a few of these specimens on my property as well, but out of consideration for the neighbors, I will cut them down piece by piece and plant something with leaves there instead, which doesn’t completely darken other people’s corners even in winter. Especially on the west side, I find them a nuisance.

I believe these beasts were planted in the 50s, and at some point they grew too tall – then it became too expensive for the owners to have them cut down.

If you want to remove them and they have grown nicely, ask your city if they would like to have them as Christmas trees.

Otherwise, you will have to take action yourself in the fall.

If you want to remove them and they have grown nicely, then ask your city if they would like to have them as Christmas trees.

My uncle is only allowed to cut down the fir trees in his garden (state of Baden-Württemberg) up to a certain height. Beyond that, they are subject to a protection ordinance. I don't remember what height that is, but I recall that it seemed very low to me for a fir tree.

Oh dear, what really bothers me is that none of the experts here notice that these are not fir trees! And even firs would not shed their needles.

Based on the cones, I would guess spruce, and unlike larch, it is not normal for the needles to fall off in winter; you can indeed assume that the trees are not healthy. Maybe kindly(!) remind the neighbors about their duty to maintain safety, liability, etc.?
A little tip (also for the rest of your life): It's not what you say, but how you say it.