When God created man He gave man dominion over the earth. The earth we live in is a physical realm while the habitat of God is in heaven, which is a spiritual realm. The way we have boundaries in this earth and not able to do anything in the spiritual realm with our physical body is the same way God is restricted to the happenings on the earth because He has already given authority to man in the first place.
Due to the authority God bestowed on man, every occurrence that happenings on the face of the earth are a resultant effect of man's actions and not God. God gave man total control of the earth that He had to give man freewill, which is the ability to do whatever he wants, without needing to be compelled to do so. So whatever we do there are consequences that play out that God on His own cannot intervene unless we reach out to Him.
2 Chronicles 7:14 KJV
if my people, which are called by my name, shall humble themselves, and pray, and seek my face, and turn from their wicked ways; then will I hear from heaven, and will forgive their sin, and will heal their land.
In this passage, it is clear that God is aware of the situation the people are going through and even though they are His people untill they call upon Him their situation will remain the same. God is not to blame here, instead it should be man. It's irresponsibility that makes us but the blame on somebody else.