He then went on to say, "Finally, whether you are citizens of America or citizens of the world, ask of us the same high standards of strength and sacrifice which we ask of you."

Nonsense.

John Kennedy was by most measures, one of the better US presidents. But he did believe in the concept that the role of the people of a country should be to serve their country and to sacrifice themselves to it.

Again… nonsense.

Let's put this in perspective.

In seeking employment, you don't seek a particular job because your primary concern is that, in that job, you can "make a difference." This is a nice thought, but it's not why you seek a job. You seek it because it will provide you with what you're after for yourself – possibly a good salary, possibly interesting work, possibly fringe benefits, etc.

You certainly don't seek a particular job because they need you to sacrifice for them.

For their part, potential employers generally try to provide good working conditions, good salaries and benefits in order to attract the best people to want to work for them.

It's the same when you seek to buy products. Advertisers appeal to your desires, hoping to convince you to buy their widget, rather than a competitor's widget. Never do they say, "We want you to buy our product because you have an obligation to provide income for us." You make your choice solely on whether that product appeals to you.

And in seeking a place to live, you might look for a community that's relatively safe, or has good schools, or has good infrastructure. You don't choose a community because it needs you more than another town or city.