Mostly people who easily get angry are not peaceful.
They're always worried and fearful.
I guess they need enough knowledge to learn more not only on the physical reality but also spiritual reality.
It takes time to be peaceful and joyful.
I hope we could achieve that and be hopeful that time will come we will get that peace and joy we're meant for.
For me, its not wealth, power nor popularity that will make us peaceful and joyful. Its our good character and virtues that matter.