Many non-appraisers come here seeking advice from The Forum. With the many laws, rules, regulations, we have to follow including; USPAP, Fannie Mae guidelines, FHA MPR's, lender guidelines, lender assignment conditions, etc. We've helped numerous people navigate through the above aforementioned items and they've been very thankful and appreciative.
I suppose with appraisals, we can't boast a 100% helpful record. Especially with those seeking advice in opinions of a value they feel is too low..... or in your case, those seeking vengeance.