It is not a case of God doesn't care, or it's God's way of getting more angels, or we just can't understand God's ways. His word the Bible plainly gives the answer as to why terrible things are happening in the world.
The fact that so many horrible things are increasing and happening all over the earth are proof that we are living in the time that God will shortly step in and do something about the wicked people and the ruler of this world, Satan. The way people are acting today was foretold to happen during the "last days."
"But know this, that in the last days critical times hard to deal with will be here. For men will be lovers of themselves, lovers of money, self-assuming, haughty, blasphemers, disobedient to parents, unthankful, disloyal, having no natural affection, not open to any agreement, slanderers, without self-control, fierce, without love of goodness, betrayers, headstrong, puffed up [with pride], lovers of pleasures rather than lovers of God, having a form of godly devotion but proving false to its power; and from these turn away." 2 Timothy 3: 1 - 5
God has even told us what he will do at his appointed time:
All of us should be looking forward to that time when God shortly brings about the fulfillment of his prophecy, the end of these last days.
(Digital elements from kit by Studio Lalie Designs called "Sky of a Winter Night.")