You also neglect to mention who gave him those WMDs
No one handed Saddam chemical or biological weapons. Did the US sell Saddam dual-use chemicals. We sure did, and so did a bunch of other countries. The US isn't even at the top of the list of suppliers. The US isn't even the country that sold him the equipment so he could manufacture his own chemicals.
Selling chemicals to Saddam that
could be used to make chemical weapons doesn't mean that we sold them to him knowing he would make weapons with them. In fact, as soon as it became known he was using chemical weapons, the US stopped all sales of dual-use chemicals to Iraq. Same thing with biological agents, as soon as it became known Saddam was trying to make biological weapons all dual-use sales stopped.
All of this has been posted on this board before. You can do searches to find the information. You won't though because, for whatever reason, you choose to believe that the US handed him weapons of mass destruction.