Human societies can't function without the slaughtering industries.
Animals aren't wasted at least, they're put to good use. 98% of the animal is used, and its purpose fulfilled. 55 percent of animals in the industries go towards meat and dairy, whereas 43 percent goes toward every day products including some of the following and many more items.
Book binding (synthetic glue used for binding is insoluble making recycling impossible)
Most salad dressings
Toner for the photocopier
Photographic and movie film
Soap, shampoo, conditioner
Also the organic industry is based around manure as fertilizer harvested from cattle farms where the cattle are slaughtered. It's all bought from slaughter houses, Without slaughterhouses, there would be no "organic" fruits and veggies, and things like DHT would still be poisoning us.
Recycling of paper could NOT happen without glue made from animal products because the glue in paper products like envelopes and books has to be animal-derived to be soluble in water, otherwise they would just pile up in landfills. Also, animal-based products are naturally bio-degradable, which synthetic materials are not. So without slaughterhouses, it would not be possible for companies to produce these bio-degradable items, like paper.
Every time you print or write something on paper, every time you eat an organic vegetable, every time you have a tooth x-ray or pack up your stuff to move in boxes, or have something dry-cleaned, you are using animal-based products bought from slaughterhouses.
Even alternative fuels (corn-based oils) are fertilized with cow manure purchased from slaughterhouses.
All of these thing require continuous slaughtering of animals, period.