so I don't see how one can acquire it legally AND download it at the same time
It is not uncommon in downloadable games to have the entire content of the game inside the distributable demo, but locked up so the player can't get to it until they pay for the game and receive codes to unlock it. I've always preferred using separate demos and full versions myself, but many developers feel otherwise and some have claimed much better conversion rates with unlockable demos because players appreciate that they can continue playing right away instead of having to download and install a new thing.
Now, remember, I've said from the beginning that this is not that huge a deal, such tools will always exist. I still think it's reasonable not to officially endorse them. To run wild with your microwave example, you legally CAN disassemble your microwave if you feel like it, but they certainly don't hand you a kit to do so when you buy your microwave and suggest that you have a go. In fact, they strongly encourage you NOT to poke around inside your microwave, and for fairly good reasons.
By wanting the tools to be kept off this forum, I'm not claiming that everyone wanting to use them wants to use them to pirate, that's obviously not true. I just don't want people encouraged to open things up for no reason, particularly when in many cases the use would be at best