“Today we can look back into the Old Testament, see Metonymy of the Subject and understand why God had to use this figure of speech. It seems clear that without the power to fight the Devil, people were better off not knowing about him. In His abounding love, God “took the blame” for good and evil, telling His people that if they believed and obeyed Him, they would be blessed, but if they disobeyed Him, He would afflict them. God’s use of Metonymy of the Subject emphasized His efforts to communicate to His people both the consequences of their sin and the fact that, if they disobeyed Him, He would have to give them up to their disobedience and let them learn the hard way. In the Old Testament, “windows” allowing us to see the spiritual battle going on “behind the scenes” are few, but they do exist (see Chapter Eleven).
Excerpt From: John W. Schoenheit, Mark H. Graeser & John A. Lynn. “Don't Blame God.” iBooks.
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In other words, people did not have "holy spirit" to properly combat evil. They were defenseless. Today people can have holy spirit because of Jesus Christ. In the old testament holy spirit was not available yet. Only a few had holy spirit "upon them " and it was conditional. Not so today.
We can walk and talk with God, he can warn us of things we could not know naturally. He has given us power as Jesus gave his disciples.
Luke 10:18-21
18 And He said to them, "I saw Satan fall like lightning from heaven. 19 Behold, I give you the authority to trample on serpents and scorpions, and over all the power of the enemy, and nothing shall by any means hurt you. 20 Nevertheless do not rejoice in this, that the spirits are subject to you, but rather rejoice because your names are written in heaven."
NKJV
Luke 10:23-24
23 Then He turned to His disciples and said privately, "Blessed are the eyes which see the things you see; 24 for I tell you that many prophets and kings have desired to see what you see, and have not seen it, and to hear what you hear, and have not heard it."
NKJV
verse 24 should raise flags to the reader. This had never been stated anywhere in the old testament. Jesus came to declare God to the people of his time. Basically he was saying, you heard it said that God allowed evil, I am saying that God is all good and cannot do evil.
Any one interested in this subject should read the book mentioned above or at the very least look a little more deeply to who God and Jesus really are.
I assure you they are loving and good.