Why didn't Russia or the US completely clobber Afghanistan? Why couldn't we win in Vietnam?
This argument also assumes that all of the military is going to stand with the corrupt government.
Jesus Christ, the last time I mentioned this argument these exact two points were mentioned. If the military does not stand with the tyrannical government, then the people don't need to rise up against the government. You've got the military on your side, which is better organised, far better equipped, actually has some experience of combat, has tonnes of resources, etc.
How 'bout this since you say I can't stop a tyrannical government with the weapons I currently have, let me have more powerful weapons then (keep in mind I'm not really interested in this).
Then don't bother arguing idiotic points? The reason you wouldn't win is not primarily because of the weapons you theoretically have, it's about amassing an organised set of forces, establishing supply lines, experienced fighters, experienced organisers, having good places to defend and attack, being able to counter heavy weaponry, etc. The reality is that most gun fanatics haven't even fired a weapon against another human let alone been in a gun fight, they'll be used to the comforts of home, running water, electricity, getting their food at the supermarket and all the other comforts of civilisation.
The Taliban on the other hand very likely have their own fresh water supply in the mountains, they have the terrain on their side, they fund their campaign through growing and selling drugs, they're very likely used to living a very conservative and basic lifestyle, obviously they have supply lines that are obviously well-protected and they've been fighting against trained killers for decades.
That's just aside from the very likely scenario that if a tyrannical government tried to take all your freedom in the US, they would wear the people down first by setting them against each other so that by the time they made their move, you'd probably think it's a good idea because of all the atheist transgender Mexicans and/or the Muslims who want to take all your women away, or something equally absurd.