Spicer was making a comparison. Assad has been using chemical weapons as bombs on the battlefield. Hitler didn't use chemical weapons as bombs although he could have. Your attack on Spicer is just another attempt to delegitimize the Trump administration by calling them names. Why don't you be honest in your beliefs and just be done with it and say the Spicer and Trump are is worse than Hitler, Genghis Khan, and Tamerlane all combined.
There. Don't you feel better now?
No, I don't feel better. I feel about the same as when Spicer claimed:
“This was the largest audience to ever witness an inauguration — period — both in person and around the globe.”—White House press secretary Sean Spicer, remarks to reporters, Jan. 21, 2017
Furthermore, there was never any doubt what Hitler did. On the other hand, we have yet to see any evidence that the gas attacks were indeed ordered and committed by Assad. Maybe yes, maybe not, but there is no evidence. Very similar to the made up WMD evidence in Iraq..