Investing in killing

Can anyone of you explain why someone is immense proud on investing billions of dollars in investments that only lead to killing of many, many people?

Can anyone explain why someone, democratic chosen, is happy for his people that they will in future work on killng machines?

It is clear that not a president is ruling that country, but the weapon industry, on top the Koch Brothers'  imperium.

In times of Hitler, the leading industry in his country was producing weapons. We are definitely in a new world war, and who is not raising his voice against it, is as well guilty for every dead war body.