Most people think that by definition the love of God must be in opposition to the wrath of God. “If God is loving, He can’t be wrathful!”
Leon Morris in Apostolic Preaching of the Cross (pages 208-209) provides a helpful commentary on this false belief:
Perhaps the difficulty arises because we are making a false antithesis between the divine wrath and the divine love. We are handicapped by the fact that we must necessarily use terms properly applicable to human affairs, and for us it is very difficult to be simultaneously wrathful and loving. But, upon analysis, this seems to be largely because our anger is such a selfish passion, usually involving a large element of irrationality together with a lack of self-control. … Those who object to the conception of the wrath of God should realize that what is meant is not some irrational passion bursting forth uncontrollably, but a burning zeal for the right coupled with a perfect hatred for everything that is evil. It may be that wrath is not a perfect word to describe such an attitude, but no better has been suggested, and we must refuse to accept alternatives which do not give expression to the truth in question. … We sometimes find among men an affection which is untempered by a sterner side, and this we call not love but sentimentality. It is not such that the Bible thinks of when it speaks of the love of God, but rather of a love which is so jealous for the good of the loved one that it blazes out in fiery wrath against everything that is evil.