I Try Not To Step On Ant's
Personally, i think the trying, is the hallmark of a good civilization, and individual.
And yet, when i was 10 - 12, i specifically recall blowing up bull-ant nests with aerosol cans for the sake of my own personal amusement.
Using that analogy, keeping in mind Hawking's concerns about being quiet in our interstellar communication's i don't personally think its the type 2 or 3 civilizations that one need's to be worried about, i think it is only those slightly ahead of us.
Because we all do, perhaps not the wisest things when we are young.