To me, I haven't yet seen how love could be used in the same way in the series. There is a passage in Skin Game that I think helps address it.
Quote
Lash. When she sacrificed herself for you, it was an act of selfless love—and love is fundamentally a force of creation. It stands to reason, then, that an act of love is fundamentally an act of creation.
Skin Game, 2014, pg 58
I don't really see any room there for using love to destroy things.
However while love is common, selfless love is rare in my opinion. Jealousy is one of the most destructive forces there is and can rise from love that isn't returned and given to another. Lash felt selfless love for Harry, but in Lasceil's case, Harry's rejection of her, swiftly turned her love into murderous hate.
You have to melt down the metal before cooling it in it's final shape, if you're making a sword etc. You can't do it the other way around.
I am a huge fan of the show"Forged in Fire."It is a very interesting contest show about bladesmithing, it is kind of like the show "Chopped,"there are three rounds,the smiths are given materials to forge a blade with in a time limit. After each round the blades are judged, then tested and someone is eliminated after each round. Anyway, the biggest thing I've learned from watching the show is a lot of cliches about making strong steel blades are totally false. First of all, you don't exactly "melt" the metal, or not completely, you heat it to the point where you can shape it, if you screw up this step, the blade will be brittle, or come apart as you try to work it.. You have to heat it before you temper it, get that wrong, again, brittle, cracked, or warped blade. One cliche I heard a lot is the more a sword is heated and re-quenched, the stronger it becomes... No, you want to avoid re-quenching if you can, because it can make the steel weaker, not stronger. Also not all types of steel can be made hard to be a serviceable blade. Finally a knife can look perfect, but it snaps when they start to test it.. Yeah, they do things you shouldn't do to a knife, but if it is forged correctly it will hold up. Back to your point, if love is forged correctly it will hold up under any test... But if it isn't, it will be brittle and break, or worse, turn to hate.