I’m no Islamic sympathiser, but that sign leaves a bad taste in my mouth similar to the taste I get from reading some of my own posts the next day sometimes. Those that know my posts and don’t have me on ignore would find that amusing. That said I can see a need for the point they are trying to make. Frankly I find the way halal animals are slaughtered sickening and would not want to purchase anything of the sort so can understand the intent.
