Is it the duty of the strong to help the weak? I think so.
What should we do?
Simple: if you consider yourself weak, then work with all your might to become stronger and more powerful. If you don’t consider yourself strong enough yet, keep working to become strong. But if you consider yourself strong, use your superfluous energy and strength to help others you consider is in a vulnerable state. Help those who get predated (predatored) by the malicious.