Without meat, we wouldn't have evolved to be the humans we are today. Humans probably were herbivorous at some point in the past, but a diet composed solely of vegetables and fruits isn't calorie-dense. The predecessor to Homo sapiens, Homo erectus, had "smaller teeth, reduced chewing muscles, weaker maximum bite force capabilities, and a relatively smaller gut" than earlier hominids.
This can be explained by the increase of meat in their diet, which requires less force and time to chew than root vegetables. We don't need large carnassial teeth like other carnivores because we learned to process the meat instead of tearing muscle straight from an animal carcass.
Our ability to process the meat probably led to structural changes in the skull and neck, including a larger, more developed brain. Moreover, cooking didn't exist until 500,000 years ago while Homo erectus have been around since two million years ago, meaning that we are capable of eating meat even without cooking it, which makes the meat even softer and easier to chew. Hence, humans are meant to eat meat and wouldn't have evolved to have the head and neck structure we have today without it.