That's why we have hell and eternal punishment, it's why I can sleep well knowing people like these will be dealt with.
As for the suffering that happens, that's also temporal, it toughens people up and builds character, just take a look at rich kids from rich families and what happens to them, they have the highest suicide rates, even tough they are not in poverty or stuck in a war zone.
Suffering is all relative, we all suffer to different degrees in life, some more so then others, but no soul is burdened with that which they can't handle so there is no need to worry about anyone getting overburdened
Some of our greatest personal triumphs and achievements come after long periods of difficult hardships and misfortunes, it's the nature of life and we love those kind of stories.
How will you ever truly appreciate paradise when you have never gone through the toils, hardships and difficulties in life ?
Be grateful that your not being tested by being placed in a war zone or a third world country that is rife with poverty.
When people begin to think the way you do despite all the blessings and being ungrateful, a calamity soon befalls that person to give them a reality check, if I was you, I would count my blessings.
Our Lord, make us not [objects of] torment for the disbelievers and forgive us, our Lord. Indeed, it is You who is the Exalted in Might, the Wise."