First hunch, Mizpeh, without doing any great deal of study on it (at the tail end of my lunch break), I would submit the following:
1. David's statements are consistent with Paul's statements in
2 Corinthians 6 where we are instructed to not be unequally yoked together with unbelievers. After all, what fellowship does light have with darkness, right? Light dispells darkness and the two cannot co-exist.
2. Jesus' purpose for "eating and drinking with publicans and sinners" was consistent with His mission - "The Spirit of the Lord is upon me, because he hath anointed me to preach the gospel to the poor; he hath sent me to heal the brokenhearted, to preach deliverance to the captives, and recovering of sight to the blind, to set at liberty them that are bruised, To preach the acceptable year of the Lord." You can't be physically distant from those to whom you are ministering.
Does that give us "license" to go into bars, etc.? I guess it depends on your intention. Are you there to kick back and partake of the debauchery and immorality? Or are you there for the specific purpose of "preaching deliverance to the captive" or the "recovering of sight to the blind"? I believe there is a place for such ministry, but one should certainly enter in only through much prayer and in the wisdom of God.
Just my $.02.
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Instead of studying to make sure what we believe is supported by Scripture, we
MUST study the Scripture to see what
IT TEACHES... then BELIEVE THAT!
Study to shew thyself approved unto God, a workman that needeth not to be ashamed, rightly dividing the word of truth. 2 Timothy 2.15 KJV