Why is Assad now offering to declare his Chems, give them up
He isn't. He's offering to pretend to, which, as it happens, isn't actually the same thing.
, & sign the Chemical Weapons Ban treaty
I'm not even going to address this one. Why sign a treaty after the consensus is that you've violated the terms of the treaty ex parte? See if you can riddle it out.
if his military:
1) Didn't Gas Civilians (Again, probably)
&
2) Isn't "afraid" of the US/France/England "punishing" him
For fuck sake, really? Because international diplomacy isn't the same as deciding if a child stole a fucking cookie. Let's look at the simplest possible reasons, shall we?
1. The chemical weapons are a hedge against Isreal's WMDs. A brokered solution involving the US neuters that threat.
2. Never used them, has no intent to, and the value of them as a political tool is actually *depreciated* by their apparent use. The value of removing them as a political tool increases greatly by their apparent use. "Benevolent old Bashir, he doesn't want to gas us so much he let the Russians take all of his gas supplies!"
3. Most importantly, and REALLY THE OBVIOUS ONE, Assad feels he's about to decisively win this war, OR, more likely has been provided the means and assurances to do so via back channels by the US. Let me emphasize again that this is almost certainly what's actually happening. The US has almost certainly brokered a conclusion to the primary military phase of the Syrian civil war that will result in Assad maintaining power (which is the outcome everyone in the international community wants regardless of "self determination" lip service) in exchange for a PR win for the current administration. I'd expect hostilities to be resolved by Spring '14.
This is how it works, you see. Everything you think you "understand" about how geopolitics work on a macro scale is wrong. Human life is cheap and essentially meaningless, ideological underpinnings don't matter, the US will smile and nod if a friendly regime slaughters it's citizens or cuts their hands off or kills women for reporting rape, etc. Regional stability where a nation state has significant economic interests is paramount. It's not a "conspiracy theory" to note this, it's just observation of the historical record. Now, of course, shit happens. Assad might get killed. The rebels might get lucky. Realpolitik fails all the time, just far less than ideologies do. In the short term, anyway. In the long term the powerful generally get what they want or decide they don't want it anymore.
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