in my opinion I should be able to do what I wish
Yeah, and in my opinion I should be able to win on the lottery every time, drive down motorways at speeds of my choosing, visit the USA without having my fingerprints recorded and photograph taken etc. etc. etc.
The reason you can record off the TV and are yet subject to DRM has been pointed out to you above. Its not the big bad BBC you should be having a go at, its the people who license content to the BBC. I'm sure the BBC's legal advisors would much prefer it if they could license content without distribution restrictions.... but that's just not how real life works.