Do we help sinners or avoid them?

Jesus told us to turn the other cheek, love our enemies, and pray for those who persecute us. Therefore, I’m not sure I understand the following verse;
2 Cor 6:17 - Wherefore, Go out from among them, and be ye separate, saith the Lord, and touch not the unclean thing

My question has 2 parts-
A) Does this mean to avoid sinners, and not to help them?
B )Or does it mean some sinners are beyond help? Is that ever the case?

Thanks,
James

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[LIST]
*]What about believers who don’t live right?
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*]Can someone who has lived an immoral life be forgiven just before death?
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