More charity? Kindness? Misplaced charity and kindness leads to abuse. If they know they can do anything they want to you and there will be no consequences, they will abuse it every time. As for being kind to the hounders, I would rather be kind to rats and mice than to many of those parasite hounders. (Rats and mice are commensals, not parasites.) And I would show no mercy for someone that intentionally set out to ruin my life, no matter how "repentant" they claimed to be.
And, if they come to me with that line of rubbish, I hope they know absolutely no German, because I will tell them in German what I think of it (the best German I can--and I am still working on improving it). I will simply pledge to give nothing to them, and if they shove any more pledge forms in my face for any reason, I will write on it in German that I will give them absolutely nothing, and that is final.