I call bs. I'm not disrespecting a goddamn thing when I speculate that it was an inside job. The fact remains all the people who died were victims of a massacre, or at least that's my conviction. The difference is I say the perpetrator should be charged regardless who it is. Not "as long as it's not our government".
Whoever taught you this strategy of argument, you really need to unlearn it. It's dishonest, worthy of the PR brigade. It's the same logic that drives "you're either with us or against us" and "support the troops" and "you cannot criticize the government in a time of war". Stop playing on emotion and putting out artificial road blocks in the discussion. Arguments are arguments, and they are just as valid regardless of how you feel about them emotionally.
There is a saying that says "the truth hurts". And you're hurting, even when it's not the truth, just one of possible truths.
The firefighters of all people. How exactly am I disrespecting them? If John lit the fire instead of Bill, is it not still a fire? A firefighter puts out fires, often at personal risk, regardless of who caused it.
This argument that we're disrespecting the victims makes no rational sense whatsoever. Seriously guys, take a step back and think about it. If this had happened (again, we're just speculating here) in any other country and the citizens were saying "no, it's not possible our own leaders did this to exploit us" you would say "those people are in denial, they can't face the truth".