^not really. all you need to make large quantities of nerve gas is a modified pesticide plant. quite a few of which were supplied to middle east countries, where one would wonder about the economics of local pesticide production. I doubt if the suppliers of the equipment and feed chemicals were in much doubt about what it was going to be used for.... they just didn't care beyond getting paid... same same for the governments.
I don't know about other countries but in the 80's british universities had large numbers of Iranian, Iraqi, Libyan and Syrian students studying degrees and doctorates in biology, biochemistry and industrial chemistry.... all of whom would be very useful for chemical/biological weapon development and production.... some of them were quite open about their eventual employment in defence.
So yes the west has a lot of responsibility for this..... but not in the way you are suggesting.