103 Grk “And if.” Here καί (kai) has not been translated because of differences between Greek and English style. This is a first class condition, but the next two conditional clauses are third class conditions, so that stylistic variation is probably at work.
104 Here the term sinners may refer to people who had no concern for observing the details of the Mosaic law; these were often treated as social outcasts. See L&N 88.295.
105 Jesus’ point in the statement even sinners love those who love them is that disciples are to go farther than sinners do. The examples replay vv. 29–30.

In other versions

“If you love those who love you, what benefit is that to you? For even sinners love those who love them.

“If you love those who love you, what credit is that to you? Even sinners love those who love them.

If you love those who love you, what credit is that to you? Even sinners love those who love them.

“If you love only those who love you, why should you get credit for that? Even sinners love those who love them!

“And if you love those who love you, what kind of credit is that to you? For even sinners love those who love them!

For if ye love them which love you, what thank have ye? for sinners also love those that love them.

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