science and technonlogy should be used for the good of socities or should be used to show power?

Answer 1

They can be used to do both. You don't necessarily have to choose. The country that can do the most good, is the most powerful. The country that can do the most bad, is the most dangerous, there's a difference.
Whether or not a powerful country chooses to exercise their power through benevolent work or not, is another thing.