tornapart says:
true Christians follow what Jesus preached...to love their enemies.
Exactly, just because I love my enemies doesn't mean that I'll allow them to rape and pillage my family and my neighbor. A true Christian would pray that God would open their eyes and hearts even as they took steps to mitigate or limit the evil to the best of their ability. There is no conflict here. Jesus never once condemned the military. A good military is a blessing from the Lord when used as protection and not agression.
All of Europe didn't exceed 25 million people in the year 1000
Yes and it more than doubled during the next 300 years after that. Keep in mind that the average live span was only around 35 years and you'll still come up with hundreds and hundreds of millions of people who lived and died during the 1200 year Papal genocide conducted by around 80 Popes in a row.