"It befits us" because we are image bearers of God and the reprobate are still made in the image of God and we are to love them. What does it mean to "love" ? In this sense, I believe it means that it is not my desire that anyone have to face God's wrath and eternal punishment. It is, instead, my desire that all men be saved. However, it is my greater desire for God to be glorified, that His will be done on earth as it is in Heaven.
Does not God share that desire with you? (1 Tim 2:4)
In that sense is not your will aligned with His?
A good acronym to remember essential Calvinist doctrine
is TULIP. Total depravity of man; Unconditional election;
Limited atonement; Irresistible grace; Perseverence of
the saints. Calvin was trained in the law which is why
his theological writings are clearly written. He was also
very clear about why he had Servetus burned at the stake.