Read carefully 2 Thessalonians 1:5-10,
"This [referring to their endurance in persecution/suffering, v. 4] is evidence of the righteous judgment of God, that you may be considered worthy of the kingdom of God, for which you are also suffering-- 6 since indeed God considers it just to repay with affliction those who afflict you, 7 and to grant relief to you who are afflicted as well as to us, when the Lord Jesus is revealed from heaven with his mighty angels 8 in flaming fire, inflicting vengeance on those who do not know God and on those who do not obey the gospel of our Lord Jesus. 9 They will suffer the punishment of eternal destruction, coming from the presence of the Lord and from the glory of his might*, 10 when he comes on that day to be glorified in his saints, and to be marveled at among all who have believed, because our testimony to you was believed."
I could quote a number of Psalms as well. The idea is simple. God's people hate evil. With God, we hate injustice. We look forward to the day of judgment, not for the sake of judgment itself, but because God is granting relief, vindicating us as his, and upholding his glory which is be marveled at forever.
*ESV says "away from", but this rendering is more clear, given the Greek construction and its actually being a quote from Isaiah 2:10, 19, 21, which explicitly refers to God's wrath being poured out due to sin. "Eternal punishment" is NOT merely the absence of God; rather the opposite, it is the full presence of God expressed in wrath.
