Would there be any need to live right, if this life was all there was?

Q: As per the Buddhist teachings  would there be any need to live right, if this life was all there was? So no reincarnation just a single life.

“Do what you KNOW to be right, say what you KNOW to be true, and leave with Faith and patience the consequences to God!” – F. W. Robertson

– There would be even MORE reason to live right. ….I wouldn’t want to spend it feeling plagued by guilt or locked in some prison. How many layers a person has the eyes to see through, before they know the difference between the right thing and the wrong is difficult to say, Some people kill flies. Is that right? If the death of one fly alters the universe slightly….and obviously it harms one.
the obvious answer would be not to kill flies, or anything else either? Is that living rightly? (non action)

For example, look at sports….during training, playing well is important but not critical. Because you’re just training, you will always get more chances to try again.

But….once you get to the Olympics it is critical to play well, because you have just one shot at winning thr gold.

The same is true for soldiers. If they make mistakes on the training field, it’s not a problem. But, on the battlefield, making mistakes is fatal.

This is just how value works. The less you have of something, the more valuable it is relative to other things. Suppose for example, that tomorrow everyone was given a billion dollars. Then, one dollar would be nearly worthless, because there would be so many dollars.

What is your thoughts?