YouTube and Blogging

[Ms Naughty]

Today I successfully embedded a video in my blog using YouTube.

At first I couldn't get Wordpress to do it because the rich text editor kept messing up the embeddable code. But I found instructions here:
http://wordpress.org/support/topic/53570:

To insert YouTube videos in your Wordpress blog do the following:

1. Login to WordPress admin
2. Go to Options >> Writing
3. Uncheck borht Users should use the visual rich editor by default & WordPress should correct invalidly nested XHTML automatically
3 and a half: Go to User >> Profile and turn off rich text there
4. Go to Write >> Write Post
5. Paste the 'embeddable player' code for your YouTube video in the write box
6. Publish video

I'm pleased to say this handy set of instructions works. Now I find myself thinking I could easily fill up the blog with YouTube videos.

BUT

Is it ethical? I'm not sure where these vids come from. Should we care? Or is it just "fair use"?

Your thoughts?