Is it normal to from time to time think about death or suicide? With all the problems the world have, do people think and say" is not worth it, might as well get it over with"? I mean we all have our ups and downs

I think everyone have thought about death suicide. It's normal. But you should divert your attention to something else,such as cultivation of some hobby. Everyone have ups and downs. It is not worth committing suicide.

I think that almost everyone has thought about it. I have had friends attempt it and a colleague succeed. I have thought about it so many times that its easier to count the times I wasn't thinking about it.

Depends on the person.
In many cases the person has an underlying illness or issue.
In other cases it can be a perfectly rational decision to come to if you look at it in a purely logical manner devoid of any emotional judgment.