Marten in the sloping roof of the new building? Construction defect?

You seem to be an extremely irritable person who gets offended quickly. At least these few lines from you give a deep insight – if one can even say that. I can well imagine how annoying that is, but take a deep breath – that really falls under "bad luck." You can't be protected against everything, so it can happen to anyone.

...what am I supposed to say to that...???!?!?!?!?

Actually, I am not currently engaged with my hobby, but I have a serious question about a topic that is serious to me....that is what I can say about it...

I actually thought I had a forum here where I would be taken seriously... But of course, there are no better answers from "money sharks" right now to such questions, thank you very much!!

What you shout into the forest comes back...

Sorry, a really weak performance here to demean a forum member because of their profession...

Have you ever taken a look at the forum rules - especially point 2?

2. Netiquette

2.1) No insults
Users or publicly addressed persons, companies, or organizations must be treated with respect. Terms like bum, lousy shop, etc. are to be avoided.

No regards from another "money shark"

Report me and kick me out...

It's really intense how people can react like that, instead of first trying to educate themselves in the vastness of the web. If the OP had done this, it would be clear how these animals can gain access. And there are plenty of references to experts who are familiar with this as well.

One of many possibilities would be to contact the forestry office, which can name experienced hunters with the appropriate authorization and experience. To get to the bottom of these critters, experience is required. Looking for the mistake in the lack of trees is absolutely the wrong approach.