Actually, both are right. While ISIS is al Qaeda in Iraq, it's evolved to more than that, thanks to the West getting its hands dirty in the so called Arab Spring, and happily endorsing the toppling of Ben Ali, Mubaraq, Gadaffi and then Assad. While the first 3 went easily and the West made an assumption about these peacefully transitioning into pluralistic societies - none of which happened - in Syria's case, what resulted was a civil war, since there was no way the Alawites were gonna let the Sunnis come to power, similar to Shi'ites in Iraq. That would have resulted in a revenge bloodbath.
Also, while HRC, who I fully oppose, did do her part in destabilizing the whole region, it's worth remembering that at the time, even the Republicans supported toppling Gadaffi, and only changed their views on what was going on after Benghazi. Trump however was on record as saying that removing strongmen like Mubaraq and Gadaffi just destabilized the region. In case of Egypt, they recovered by undoing the Morsi coup (or else, Egypt would have been an ISIS republic today) and El Sisi just minding their own business in putting Egypt back together, and not bothering about leadership of the Arab League, leaving it to KSA and Qatar. Libya, on the other hand, became another Somalia.
Incidentally, the Republicans (not including Trump here) are in a time warp of their own in the 80s. For them, it's still about a contest w/ Russia for influence, as well as not forgetting the days of enmity during the golden age of Reagan. Yeah, in the 80s, Gadaffi was a terrorist, and he did deserve to be bombed in 1986. But after the ouster of Saddam Hussein, apart from the mess that was Iraq, one good effect of that war was Gadaffi deciding to reform and repair relations w/ the West. He voluntarily exposed and ended his WMD program, decided to settle the financial claims of everybody who hated him due to Lockerbie, and restored diplomatic relations w/ Western countries, particularly the US and UK. Once that happened, we had no business trying to topple him.
Instead, by participating in the bombing of Libya in response to schizophrenic appeals by the Arab League (who on one hand wanted the US to destroy Gadaffi's fighting abilities but on the other, not to hurt Libyan citizens), the West created a situation where Gadaffi was savagely murdered and replaced initially by an Islamic regime, and later by something nobody can figure out. In the meantime, ISIS took over Cyrenaica, and Benghazi happened. What that's done is telegraph any dictator anywhere in the world who's hostile to the US - 'Don't bother kissing & making up - the West will have no qualms about stabbing you in the back'. Good job, Obama, Hilary, McCain, Boehner, Hannity (who supported this at the time, even if he opposed it afterwards) et al.