Aside from you innate prejudices, Catholics are Christians by definition. Whether what the Crusaders did was Christian or Unchristian according to the New Testament is immaterial and beside the point. The point is that the Crusaders were Christian and came from Christian Nation States where Christianity was in it's primacy.
There is also no uniform promotion of pacifism in the New Testament, The Old Testament advocates Holy War and Scripture can (and was) used to justify the Crusades and the actions within those Crusades.
Your logic also fails because while not all Drivers are Drunk Drivers, All Drunk Drivers are Drivers by definition. Just as not all Christians are Catholics, but all Catholics are Christians.
So where in the new testament does it advocate war? I'd love to know! To say there's no promotion of pacifism is stupid. Have a look at the below scriptures:
Repay no one evil for evil, but give thought to do what is honorable in the sight of all. If possible, so far as it depends on you, live peaceably with all. Beloved, never avenge yourselves, but leave it to the wrath of God, for it is written, “Vengeance is mine, I will repay, says the Lord.” To the contrary, “if your enemy is hungry, feed him; if he is thirsty, give him something to drink; for by so doing you will heap burning coals on his head.” Do not be overcome by evil, but overcome evil with good. -- Romans 12:17-21
But I say to you, Love your enemies and pray for those who persecute you, -- Matthew 5:44
"You have heard that it was said, ‘You shall love your neighbor and hate your enemy.’ But I say to you, Love your enemies and pray for those who persecute you, so that you may be sons of your Father who is in heaven. For he makes his sun rise on the evil and on the good, and sends rain on the just and on the unjust. For if you love those who love you, what reward do you have? Do not even the tax collectors do the same? And if you greet only your brothers, what more are you doing than others? Do not even the Gentiles do the same? ... -- Matthew 5:43-48
And yes, it's true drunk drivers are still drivers, but using your logic is like saying the law is wrong. They went against the law; just as these Christians went against the teachings of Christ.