How to use "as simple as that"

It is actually not quite as simple as that!

We must remember, however,

that the world is not quite as simple as that.

It's as simple as that. 

Sources:
http://www.fluenteidiomas.com.br/como-dizer-isso-em-ingles/simples-assim-as-simple-as-that 
http://pt.bab.la/dicionario/portugues-ingles/simples-assim

♫ And now, what about practicing with Paul McCartney? :) ♪

"Simple as That" was written by Paul Mc Cartney.

Lyrics | MetroLyrics 

I know it isn't easy to refuse
A lot of thoughts are flying through your head
Tell me this before you have to choose
Would you rather be alive or dead?

It's as simple as that
Would you rather be alive or dead
It's as simple as that, it's so simple
It makes you wanna cry

They ask you if you wanna join in
You linger for a minute or so
Well, now's a perfect time to begin
Are you gonna say yes or no?

It's as simple as that
Are you gonna say yes or no?
It's as simple as that, it's so simple
It makes you wanna cry

And if you love your life
Everybody will love you too
Yes, if you love your life
Everybody will love you too

It's harder when you start to get 'round
I want you to remember what I said
I know you never like to let them down
But would you rather be alive or dead?

It's as simple as that
Would you rather be alive or dead?
It's as simple as that, it's so simple
It makes me wanna cry

Yes, if you love your life
Everybody will love you too
And if you love your life
Everybody will love you too

Would you rather be alive or dead?
Would you rather be alive or dead?
Would you?

It's as simple as that
It's as simple as that
It's as simple as that

And if you love your life
Everybody will love you too
Yes, if you love your life
Everybody will love you too