Reply To: question about tisha b'av

another question i had (yesterday)

why don’t we say tachnuun on tisha b’av?

answer: because it’s called a moed

question: if so we shouldn’t have said it yesterday why don’t we say it on the tenth of av (this year) yimos hamoshiach it won’t be a moed

i have my own answer which no one has said before that we’re aveilim and in a beis aveil there isw no tachnun

if so why isn’t that the reason