Let's make this current, shall we?
Is the good saint saying, by "taking their part" that we must refrain from speaking ill of terrorist Islamists? That we should feel sorry for them when they meet with "reverses"?
If we are to refrain from speaking ill of them, certainly we can't pre-emptively kill them, can we?
There are Christians and Catholics on this forum who have argued that we have no right to fight back against terroists based on the misguided notion that we must "love" them.
Love does not mean passivity in the face of an evil like al-Qaeda. It cannot.
Otherwise, we are all dead, and so are our children.
When "speaking ill" means calling them animals, denying their humanity, asserting that all Arabs should be nuked, delighting in their probable damnation: Yes. Absolutely such speech and the attitudes it expresses are sinful. IMO. And I see them frequently on this forum.
If we are to refrain from speaking ill of them, certainly we can't pre-emptively kill them, can we?
Our primary interaction with them should be trying to convert them, not kill them. "The love of God causes us to love Him more than our wealth, our health, our good name, and even our life, and the love which we should have for our neighbor should enable us to love him as ourselves, so that all the good that we should wish for ourselves, we should wish for him." The primary good we should wish for ourselves is Salvation. If we must kill terrorists, etc, we should at least recognise that their death and probable damnation is a horrible tragedy. Even if they brought it on themselves.