Have Christians given a needless negative connotation to the word ‘lust’?
There is a bigger point that I think you hit upon here. The Bible instructs the church to judge their own and not the rest of the world. Christian rules about lust (and any other sin) are only meant to apply to themselves, not the world. God will judge the world, Christians are only to judge their own. However, it is far easier to judge others sin, to condemn a stranger, instead of looking at one’s friends or one self. But this is not a condemnation of all Christians (I am one). This is human nature, as much as lust is human nature. I suppose one could argue that the urge to pass-the-buck and ignore ones faults is natural and serves some purpose toward happiness and perhaps Christians should embrace it… but I imagine that not all human urges are entirely healthy, even without the condemnation of of an overbearing religion.