Sleight of hand?

If you're trying to convince somebody of something which you can't prove, then one strategy is to take a closely associated subject which you can prove and keep throwing that at them in the hope that the fact that you can prove that will confuse them into thinking that you have proved the other.  This is exactly what the US (and to a lesser extent ourselves) are doing over this business of chemical weapon attacks in Syria.  We are being bombarded with images of people, and in particular children, suffering from the effects of what is probably sarin gas.  But this is the associated subject - nobody is really denying that sarin gas was used and that these people are the victims.  The question of course is who perpetrated the attack?  The US (and to a lesser extent ourselves) would like you to believe that it was the Assad regime who did this, and they may be right  - but where is their proof?  The US Secretary of State keeps saying "we know" this, that and the other, which to me is just code for "you'll have to take my word on this - trust me".  Now let me think - trust what a self-serving politician is telling me....?  Er...No.