At least they're re-creating something big. Jurassic Park notwithstanding, large animals are far less of a threat to humans than something small that could become an invasive species. Humans have tens of millions of RPG rounds in stock.
What is this, Horizon Zero Dawn? Will we have to steal parts from the mammoth's cauldron facilities for our survival, while the mammoths continue to get stronger and stronger in an unstoppable paperclip optimizing loop?