Before we answer this question, we first need to understand two essential facts stated in the Bible:

1. No one is truly innocent

Romans 3:23 (KJV)

For all have sinned, and come short of the glory of God;

2. No one will be without excuse before God

Romans 1:20 (NIV)

For since the creation of the world God’s invisible qualities—his eternal power and divine nature have been clearly seen, being understood from what has been made, so that people are without excuse.

One does not have to be Christian to know right from wrong; it is built inside of everyone one of us; therefore, no one will be able to give an excuse for their actions in front of God. 

More importantly, judgment has always been Gods last resort; let’s look at a few cases in the Old Testament: 

• God agreed to spare the nation Sodom and Gomorrah for the sake of ten righteous people as Abraham pleaded with Him.
• Noah was warned 120 years before God judged the earth with the flood.
• God waited 430 years to judge the Canaanite nation because of their sin.

Likewise, several instances are documented in the Old Testament, where the prophets reminded the people of the impending judgment, which in a sense, depicts God’s mercy as He offers a chance to repent and change.

Examples of God’s mercy are seen in the case of Jonah in chapter 3 or with Rehab right before the conquest in Joshua chapter 2. 

Nonetheless, God’s call for destruction was never the result of any ethnic cleansing; instead, it was focused on cleansing the nations from their idol worship, immorality, and total rejection of God.

When this happens, the state of human nature sinks below, and we resort to all sorts of wile thinking and practices. 

In conclusion, it might be overwhelming how human nature can be deceived/given into sin, so much so that we would entirely reject the grace of God and blame Him for the consequences of our sins. 

We must remember that God’s grace can still be experienced today from what He did for us at the cross.