I'll attempt to answer this question without writing a book. "Appeasment" is the watchword of the Left. It is born from a hatred of America and Western culture that blinds the Left to the evils in anything. It is the fuzzy logic that erases the word "evil" unless it is applied to all things conservative (ie individual freedom/responsibility, individual rights vs the state, morality and right vs wrong, limited gov't, equal rights for all, as opposed to special rights for some: ie hate crimes).
The Left is not blinded to evil. Most know, deep down, that when Bin Laden says "kill all non-muslims" he means the Leftists too. The Left IS blinded though. They are blinded by hatred. Hatred for America, hatred for conservatives, hatred for President Bush (who probably did get the popular vote, but the military vote was thrown out by leftists in the election while many dead people voted for Gore..... what idiot dis-enfranchises their military??? Answer: the leftists), hatred for Christianity, and hatred for all things "Western". This hatred exceeds their sense of duty to protect the country, our allies, and confront the true evil of Islamofascism in the world
What could they like in Islamofascism? Well, first, it's not Christianity, so in thier minds that's a big plus. Second, its fascism, which is simply socialism by another name. Since they are mainly of the socialist vein, there is the underlying appeal of a fascist gov't for the left. Think I'm wrong, describe Hitler's gov't leaving out the actual killing of Jews, Christians and "undesirables" (you can still say the gov't would "re-educate" them in camps. Many leftists I went to college with supported this ideal of leftist "tolerance") and you will find a gov't the leftists like.
Finally, and I know this is long, we come to the right of self-defense. When have you known a leftist to stand for this, not counting DiFi's, Rosi O'Donald's, and several other prominant Leftist's CCWs for themselves and their bodyguards? If the Left acknowledges the right of self defense for a country, they slide down the slope of having to acknowledge the right of the INDIVIDUAL to self defense and undue years of their anti-gun/anti-freedom lies and attacks.
And that's my initial take.