This article is not based on flawed facts and personal opinion. Tisha B'av This is certainly no secular holiday it is one of the holiest days in the jewish calendar and possibly even the saddest ( Yom Kippur is the holiest but its not actually a day of mourning its a day of judgement ) Tisha B'av. is a time to mourn because the Temples were destroyed both on the same day but in different years its certainly not a day to be at the beach having a good time. How do you actually know that nobody wants a third temple? If it does come it will be in messianic times and there will be no secularism everybody will follow jewish law to the letter the world we live in today is not the same as the world will be in messianic times. Also the Temple Priests said that there were times to fast and I am not just talking about Tisha Ba'v. People would reguarly fast on sad or sollum days. You are looking at this who issue from the point of view of a modern day secular and not from a religious perspective of the past or future when religion meant everything to all jews and there was no secularism.
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from the article: Anshel Pfeffer / It is wrong to fast on Tisha B'Av