Based on what happened on Earth, to evolve advanced intelligence faster than asteroids reset life probably requires a war making disposition. We killed off all our serious competition, so a second rule is only one advanced intelligence life form survives in a domain, such as one Earth or one galaxy. If we are not alone the odds are humans will be killed off as as competitive nuisance. We should keep quiet. This is the best guess based on what we know about the millions of life forms that had their day on Earth.
I think you’re drawing the opposite of the logical conclusion.
Based on what we’ve seen of humans, as a violent civilization becomes more advanced, a progressively smaller number of hyper-violent individuals are able to do progressively more damage.
It would take a medieval army days to do the amount of damage a WWII bomber wing could do in 5 minutes.
All of the people in history couldn’t have done the amount of damage a few thousand would have done, had we had a nuclear war in the 60s.
50 or 60 years from now - or sooner - a small lab of determined scientists - perhaps a dozen people or less - will be able to tailor make a possibly unstoppable virus and release it on the world - imagine if the Nazis had possessed a complete understanding of the human genome.
Every advance of a violent civilization increases its chances of meeting a violent end.
I could be wrong but, it makes perfect sense to me. Much more than the opposite, anyway.
There is also the possibility that they must come here because they destroyed everything where they were. Kind of like liberals fleeing the cities.