The Answer

  They may be one of God's experiments.
 

Question:  Why are there so many nasty, raunchy, messy, sloppy, poorly groomed and dressed people everywhere?

Answer:  Because there are so many genuinely homely, ugly, unattractive people.
Excuse:  Each and every day they arise, go into their bathrooms, and look at themselves in their mirrors. No wonder they they act, dress, and do everything in the nihilistic ways that they do.
Pity them. Imagine if you were that homely. You might be that miserable also.

It appears that when God was assembling many of these homely people He used poorly-designed parts that failed to conform to specifications.
We may wonder why He used those poorly fitting components and why He didn't discard the homely people once they were assembled and ready to ship down to earth.
It appears likely God calculated that all these homely people were just what the attractive people needed to provide perspective. God may have wanted to see just how the slightly-attractive people -- around 12% -- would handle themselves.
Today we can observe the results of God's experiment just about everywhere. The homely people are nasty, mean, and dumb. The slightly attractive people are nasty, mean and dumb.