Loving one's enemies does NOT mean giving in to evil. Everyone has a God-given right to self-defense against evil.
Loving one's enemies means neutralizing evil with good/truth rather than using evil to fight evil, the latter of which only multiplies evil.
If we were keeping and enforcing The Law that God gave us -- which includes the death penalty for all capital crimes -- we would lovingly and lawfully be putting evil out from among us as God COMMANDS, while making this world a better, more loving environment for all concerned.
Romans 13:8-10
13:8 Owe no man any thing, but to love one another: for he that loveth another hath fulfilled The Law.
13:9 For this, Thou shalt not commit adultery, Thou shalt not murder, Thou shalt not steal, Thou shalt not bear false witness (lie), Thou shalt not covet; and if [there be] any other commandment, it is briefly comprehended in this saying, namely, Thou shalt love thy neighbour as [or more than] thyself.
13:10 Love worketh no ill to his neighbour: therefore love [is] the fulfilling of The Law.