God, the same yesterday, today, forever

If that is true, which I do believe, then why do we continue to as Christians dwell on the "God is love, peace, mercy, flowers, waterfalls and bluebirds singing", when He is a God of great Judgement as well?
Are we missing half the story?
Our Sunday School class has been studying 1Samuel and specifically the "Ark Effect" in chapters 3-7. Read that sometime and then convince me that God isn't bringing judgement even now?

Someone in class pointed out that God could even be bring on some of the diseases and sicknesses we have now. That we might blame sin or the Devil when in fact it could be God. I don't know that I believe that for sure but, take a minute and a concordance and look up the term "hand of God" and see what it says. It was the same everywhere in the Old Testament as well as in the New Testament, therefore if God doesn't change, his Hand is the same today.
Quote scripture to back up your thoughts please. Lets have Biblical discourse.