I’ll attempt to give you some proven information

Croplands make up one-third of agricultural land, and grazing land makes up the remaining two-thirds.3

However, only half of the world’s croplands are used to grow crops that are consumed by humans directly. We use a lot of land to grow crops for biofuels and other industrial products, and an even bigger share is used to feed livestock.4

If we combine global grazing land with the amount of cropland used for animal feed, livestock accounts for 80% of agricultural land use. The vast majority of the world’s agricultural land is used to raise livestock for meat and dairy.

https://ourworldindata.org/global-land-for-agriculture

How we go about forcing the food industry to focus on feeding instead purely on profits, is largely a policy (corruption) matter. Whilst diet; individuals have the power right now to make a difference. Systemic food waste is not the only point of inefficiency we have in our food supply system.

On top of that the less government funding the meat&dairy industry gets the more is available for vegetable crops or other social services.

Just because I have a different perspective doesn’t mean I’m not agreeing with you in terms of waste inefficiency.