The same argument could be made for the deaths of humans, too. If you consider the consequences, are the deaths of 100 humans worth it to get interplanetary travel? Some people, maybe even you, would argue that it is indeed worth it.
People aren’t birds. If hundred of people would die for this launch, I don’t think that’s acceptable.
There’s a certain amount of bird/wildlife loss is acceptable, but I don’t know the amount. But there are costs to rocket launches, and wind power, and many things that will kill a small number of animals.
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