I think the meaning of love in christianity is very different from what more secular people think it is. For example it does not preclude sending someone to prison. Christianity has a very well defined and categorized (sexos/eros/philia/agape) understanding of love. It is also not a feeling.
> "Love your neighbour as yourself"
That is a very important part of that understanding of the meaning of love. While it also means that you love your neighbour in any circumstance, it importantly says that you should love the neighbour in the same way you love yourself. You love yourself even when you know you are evil and should die.
The stance of the (catholic) church is that you should damn the sin and love the sinner.