Why does not a CR (Carriage Return) automatically start a new line on some online text editors?

Sometimes you want to write something with broken lines and you write in the editor:

That's right I'm SokkaIt's pronounced with an OkkaYoung Ladies, I rocked ya!

But it ends up looking like this:

That's right I'm Sokka It's pronounced with an Okka Young Ladies, I rocked ya!

The fix is to add two spaces between the final character and the carriage return.

I don't understand what the problem is. CR should be easy enough to translate, and the users intentions are clearly confirmed because they're looking right at what the expect it to look like when they hit submit.

Why does the user have to add two spaces? Why is the universe like this?

Edit: Holy Shit, look, I'm just an idiot typing text expecting WYSIWYG and I don't see a good reason for why I'm not getting it other than that programmers lack theory of mind.