The speaker depicts the Americans as unable to cherish the beautiful moments because they are <em>always in a hurry</em> to think about what other things they can accomplish due to short time. This shows their materialistic side that once they achieve one thing, they relax and, in just a moment, they become violent again to get more than they achieved.
They always want to achieve things easily <em>without thinking about the consequences of their actions</em> on others because they want to be <u>easily gratified. </u>They are not immediately contented nor do they find things perfect for their satisfaction. Thus, they are always<u> restless and anxious</u> and it makes them<em> unhappy</em> even if they have the abundance of things.