People who complain about heavy traffic, crowded stores, long lines, etc. as if they think they have a right to be there and no one else does.

They don't seem to realize that, just by being there, they are helping to create problem just as much as anyone else is.

The old adage "If you're not part of the solution, you're part of the problem" couldn't apply to any situation more clearly than it applies to crowdedness.

If crowdedness is a problem for you, you need to figure out when the off-peak hours are, and arrange to do your shopping/traveling/commuting at those times. That's how you become part of the solution. If you don't do this, it's your own fault you are inconvenienced by crowds.