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To me that's not a culture , but a bias (the hunter gatherer bias).....there are thousands of animal species serving no real purpose for our cause and still we slow down our growth because of concerns regarding their survival , not only that , but after having analyzed our daily values and necessities it becomes perfectly crystal clear how we'd only really need the 5 big crops + plants for photosynthesis , insects and impollinators in order to survive and thrive , plus we would be able to support much more people ! Imagine a planet where 15 billions humans live and each and everyone of them consumes 2700 kcal/day and contributes to the world's economy because nobody has to suffer hunger anymore.... that would be possible if we got rid of wastes and inefficiencies . So In my opinion if we ever find other forms of intelligent life and we can't trade with them , eat them , learn from them or acquire knowledge studying them , then yes I am all up for bombing them , just as I am all up for (and I know many will hate me for this :-D ) running a railway + HVDC line through the giant panda's territory , or finally get rid of domesticated animals like cows which convert calories and proteins from grains so poorly .
Also I agree with @woodchopper , we should stop sending messages literally "Across the Universe" in order to avoid perishing . An other approach we might use in the remote future could be only using old technologies to broadcast an "hello signal"..... stuff we've long moved from , so we could try to select for civilizations which are way behind us technologically so we could sort of be in control of their destiny like your usual anthill , but even then it could be a trap or they might catch up during the time necessary to make the trip or they could be monitored by some other advanced civilization which is not monitoring us , so we would just signal our presence to them as well...
Hmmm. wonders if the open thread is a place for a quick analysis of that news item going around about interesting optical signals seen in a few hundred stellar spectra from the sloan digital sky survey ...