Your right humans spread them as semi wild pets to protect they food stock from rodents but for Europe that where the romans over 2000 year ago, so i would not say that they are a new emerging existencial thread for the eco system here, if that was the case it would have long colapsed lol.
Cats originated in Egypt and spread across the world basically by humans. So unless you’re in Egypt, cats aren’t native to your ecosystem.
Your right humans spread them as semi wild pets to protect they food stock from rodents but for Europe that where the romans over 2000 year ago, so i would not say that they are a new emerging existencial thread for the eco system here, if that was the case it would have long colapsed lol.
This is completely faulty logic not backed by reality or even a single source.
Here is some further reading:
https://www.scientificamerican.com/article/cats-kill-a-staggering-number-of-species-across-the-world/