The side that has the will to prevail in this twilight struggle

It's not the West.

We have Susan Rice.  They have exhortations like you find in the latest issue of their magazine, Dabiq:

“Every Muslim should get out of his house, find a crusader, and kill him. It is important that the killing becomes attributed to patrons of the Islamic State who have obeyed its leadership. This can easily be done with anonymity. Otherwise, crusader media makes such attacks appear to be random killings.”

The magazine didn’t reference specific attacks, but provided a few tips for keeping attacks simple and to the point.

“Secrecy should be followed when planning and executing any attack. The smaller the numbers of those involved and the less the discussion beforehand, the more likely it will be carried out without problems. One should not complicate the attacks by involving other parties, purchasing complex materials, or communicating with weak-hearted individuals. ‘Rely upon Allah and stab the crusader’ should be the battle cry for all Islamic State patrons,” an article states.

The magazine’s fourth issue features pictures of electricity maintenance and road cleanup in the Islamic State, along with an ISIS-run retirement home in Mosul. It contains a story of Ansar al-Islam in Iraq pledging allegiance to the Islamic State. It also contains lengthy essays that the IS claims were written by late American journalist Steven Sotloff and British hostage John Cantlie.

“We will conquer your Rome, break your crosses, and enslave your women, by the permission of Allah, the Exalted,” a statement from the ISIS spokesman says. “You claimed to have withdrawn from Iraq – O Obama – four years ago. We said to you then that you were liars, that you had not withdrawn, and that if you had withdrawn that you would return, even if after some time, you would return. Here you are; you have not withdrawn. Rather you hid some of your forces behind your proxies and withdrew the rest. Your forces will return greater in number than they were before. You will return and your proxies will not avail you. And if you are not able to return, then we will come to your homeland by Allah’s permission.”

The magazine says that would-be jihadists shouldn’t think twice before killing citizens from “crusader” countries.

We still puke all over ourselves about our legacy of slavery, an institution that was reviled from the get-go here.  We had measures such as the Northwest Ordinance and the Civil War to bring about its end.  Our enemy exalts it:

The Dabiq issue includes another article praising slavery and its “revival,” using the capture of Yazidis as an example.
It describes how Yazidi women and children were “divided according to the Sharī’ah amongst the fighters of the Islamic State who participated in the Sinjar operations” and analyzes how “one of the signs of the Hour is the increased conquests and bringing in of slaves from the lands of kufr.”
“One should remember that enslaving the families of the kuffār and taking their women as concubines is a firmly established aspect of the Sharī’ah that if one were to deny or mock, he would be denying or mocking the verses of the Qur’ān and the narrations of the Prophet (sallallāhu ‘alayhi wa sallam), and thereby apostatizing from Islam,” the article states.
“Finally, a number of contemporary scholars have mentioned that the desertion of slavery had led to an increase in fāhishah (adultery, fornication, etc.), because the shar’ī alternative to marriage is not available, so a man who cannot afford marriage to a free woman finds himself surrounded by temptation towards sin. In addition, many Muslim families who have hired maids to work at their homes, face the fitnah of prohibited khalwah (seclusion) and resultant zinā occurring between the man and the maid, whereas if she were his concubine, this relationship would be legal.”

This isn't the rantings of some ragtag band.  IS has an army of at least 30,000, many of whom have passports to western countries such as the US.

And we don't have the will to address it adequately.