Could the "Grasshopper civilization" be actually dangerous?

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Could the "Grasshopper civilization" be actually dangerous?

This is the writing about a hypothetical case, where some alien would land on Earth.  When we are thinking about the species what would land on our planet, they should use bio protecting suit while they are resting on our planet. And some people are believing that the Anunnaki, the ancient Sumerian gods were alien astronauts, and the handbags, what they carried were the bio-filters, what mission is to filter microorganisms out from the breathing air.

Actually, we haven't met any member of Anunnaki-community, and the purpose of those mysterious handbags might be that they were dumbbells, what mission was to give strength to those people. Or maybe they were the things like the fashion of the high-class Sumerians.

Even if the purses are female things in modern society, they might be the fashion of men in the Sumerian community. The purpose of those purses could be that the Anunnaki would carry their tools like psilocybin mushrooms in it. Or they can be the air cleaners for ancient astronauts. The real answer would know only the Anunnaki. And that would open the door to speculations about the purpose of that mysterious handbag.

In the beginning, we must say that every intelligent species might be dangerous if they are feeling that they are under threat. And if the intelligent species is under the attack, it would defend itself. This kind of things would make the thought that the grasshopper civilization, what travels from the solar system to another other solar system and benefit the entire planets. And in some scenarios, those species would also make other civilizations their slaves.

But we can think this case by a little bit another ways. The thing is that those aliens would live in their spacecraft in the full controlled hemisphere, where things like radiation and temperature would be very comfortable. Those aliens might not want to land on the planets and face the rain and cold or extreme hot temperature. And would they actually want other species in their spacecraft?

The threat might be, that the civilization destroys entire planets for creating the new spacecraft and other things. And if those aliens would not look at things like, what kind of planet they would destroy, the results would be terrifying. But if some kind of micro-organism is released in the spacecraft, the entire crew could die. And also in this kind of cases, the super civilization would face the situation, that there would be other super civilization, what would attack against that kind of attackers, what would destroy other species without the reason.

Picture I: https://www.ancient-origins.net/sites/default/files/mysterious-handbag_0.jpg