Weapons are produced by capitalists. War increases demand for weapons.
Destruction renews demand. War is destruction.
Capitalism has the tendency towards mono-/oligopolies rather than equity. Therefore, over time, decision power becomes centralized and it’s less likely that decisions wil be made for the overall economy rather than oligopolists.

As all this is known since 3 centuries, existing national capitalisms took several measures against these tendencies. However, international capitalists are harder to manage. Also, most assets are collective attributions. E.g. if the stakeholders think, X, SpaceX, PayPal and Tesla, etc. aren’t worth a penny, Musk will rank down instantly.