What can ya say? The (once-they-Ascended) Alterans are complete hypocrites; they strictly adhere to non-interference with mortals, but are either unwilling (or somewhat more charitably, unable) to enforce the same restrictions upon their former 'cousins'.
Unable, the reason the Alterans fled the Ori in the first place is because the Ori were the more powerful faction. The thing about being Ascended is that despite claims to the contrary, Ascended beings are
totally small-g gods and actually gain power from being worshiped. So the Ori were all bloated on faith energy and the Alterans weren't and thus couldn't match the Ori in magic fight times.
So back when the original Ancients discovered Ascension they split into two factions; the Alteran faction who decided that this Ascension thing was a great way to ponder the deeper mysteries of the universe without being bothered, and the Ori who decided that this Ascension thing was a great way to BECOME GODS AND CONQUER ALL OF REALITY MUAHAHAHAHAHAHAHA!
The Alteran faction were then all 'no you can't do that its bad and you're lying to your worshipers about Origin because you're not actually taking their souls to heaven
at all' and the Ori responded with 'FUCKING TRY TO STOP US NOOBS', followed by the Alterans doing what they
always did when confronted with a difficult problem; they ran the fuck away and hid.
Their shame over the Ori is also why the Alterans enforce their ridiculously hypocritical 'no interference' laws; because they're afraid that they'll end up going down the same path if they're allowed to mess with mortals.
"WHY THE HELL ARE YOU STILL USING THAT KITBASHED CONTROL SYSTEM, MANUALLY DIALING IS FOR EMERGENCIES NOT PRIMARY USE!"
Because IIRC most of humanity's problems with the gates arose from using the emergency control method as their main way of dialing even after by all rights they should have been able to switch to something that had the needed safeties, either an appropriated DHD early on or a system of their own construction later.
Some of them were yeah; while Stargates are fully functional on their own, apparently all the (relatively few) safety measures are stored in the DHD, and as the SGC gate doesn't have a DHD and is instead effectively hotwired and jailbroken with kitbashed human tech, it can and does do things that it shouldn't be able to.
But there were more than a few issues that cropped up with
any Stargate, with or without a DHD, like the trick where you run a wormhole through a star at the exact same moment that the star goes supernova and this somehow causes the wormhole to connect to the
past and time-travel its passengers.
e: I think the 'oops we accidentally dialed into a Stargate that is in the process of falling into a black hole and now the time dilation and gravity waves are ruining everything and will eventually kill us all' problem was DHD independent too.
