There's a basic pattern to most of God's judgments in the OT - warning, time allowed for repentance, then all hell breaks loose. In some cases, the time allowed was hundreds of years, such as for the Israelites and even the Amorites, whose error was allowed to 'come to completion'.
There are some cases that seem to be exceptions, such as the stoning of Achan and the guy who picked up stuff on the Sabbath. Then there was the poor guy who tried to steady the Ark of The Covenant. In these instances, judgment was swift. There were warnings given, though not directly to the individuals involved. All should have known better, but none received a reprieve.
Interestingly in Job, he took it on the chin quite hard and never received an explanation as to why. God simply questioned him with 'where were you when I...?' and then restored him. But nothing was ever really explained.
Perhaps God feels that he owes no explanation. If he didn't explain it to a man who lost everything, he's not obliged, apparently, to explain it to us.