That's not to say the Ancients were any different because helping those unable to ascend could be considered interference. The real issue is when is it considered interference. Daniel tried to stop Anubis from killing everyone on Abydos but Oma stopped him before he took action. Anubis killed everyone on Abydos but Oma saved them all because she'd already taken them through the ascension process.
So it's really a matter of catch 22. Can't stop Anubis to save the people on Abydos, yet they were saved because Oma helped them ascend.
However SG1 has experienced ascension. They saw the monk on Keb ascend, they saw Orlin ascend, they saw Daniel ascend, they saw Skaara ascend and it was all the same pretty light show. Not once did a Prior ascend, not once did an Ori soldier ascend. SG1 knew they didn't ascend people, Orlin just explained why and as it so happened, turned out to be the truth when Adria returned, after she also ascending in the same pretty light show as before. Now Prior's deciding to go KFC on themselves looks cool, but doesn't have the same effect.
Saying the Ori are bad because the Ancients told them is no different to what the Ori did to their followers, as the Ori said the exact same thing about those living in the Milky Way and any non Origin follower in general.