well, if faith enters one's heart before he can reason the things, he can answer these questions to himself. Looking for faith with reason, however, is like searching for water in the mirage. let me tell you two things the Quran says:
"From Him we came and to Him is our journey"
The fact is that we came and surely we will depart.
"everything in this world is to perish"
when something is made to perish it has little value.
Hence the death and destruction have no value, the pain is only temporary..