The government may be corrupt, but that has nothing to do with jet fuel fires being hot enough to melt steel.
The government may be corrupt, but that doesn't mean they did 9/11. Terrorists with a long history of attacking the U.S. and American interests like to attack the U.S. and American interests. Which makes the stronger case?
You have identified the fundamental problem with 9/11 Truth. They are guided by ideology, not information. They don't want to find out what really happened. They want to find out how they can blame their demon of choice (Bush/Cheney, NWO, Illuminati, Jews, etc, etc, etc,...). Ideology is the Chimpanzee part of the brain at work and nobody looks good flinging poop.
I think this point about corruption is key. governments, bureaucracies, large institutions, and of course large corporations are self serving and those who lead them in key positions within these institutions are self serving and looking to protect their positions. Accordingly this produces MASSIVE PR and spin and sometimes (often?) outright lying. So people have an understandable mistrust of what they are told by these institutions.
However, lying, PR, spin, deception, self promotion and so forth does not mean that the USG conspired to carry out 9/11.
Truthers further are driven by the notion of cui bono. The look at what the outcome of 9/11 was (policies, government spending and so forth) and assume that those who benefited from these policies and appropriations etc. actually conspired to do 9/11 FOR those very benefits. This is very much how a crime is often examined when trying to find the perpetrator.... Who benefited from the crime?
One needs to look at natural disasters which often produce policy changes and large government appropriations... But of course no government or agency or corporation caused the natural disaster. And although many suffer from disasters, others find business in relief, rebuilding and so forth. No on accuses those who find business post disaster as engaged in any sort of wrong doing.... Well some DO leverage the disaster into rip off schemes and profitable ventures such as re build contracts.
There were agencies and corporations which did benefit from 9/11 such as the designers and contractors and workers who built the new structures, the memorials etc. They didn't work for nothing. But no one is accusing these interests of causing 9/11 to get some building contracts.
The cui bono might be the military, the oil companies, intel who all seemed to make out post 9/11. But this would be the case even with an attack from some radical ME group... which would be leveraged to advance the ongoing agendas of the military, the oil companies and intel. Disaster capitalism at work. And of course these agendas would be couched in PR and spin and lies... as they always are. Nothing new there.