The spirit of five precepts The first precept tells us to refrain from killing living beings. If everyone in a city practices five precepts, everyone will become vegetarian.
Is it true the spirit Buddha wants us to develop is vegetarianism?
If every single person in a city or country practised the first precept with heedfulness, and also practised Right Livelihood, which prohibits trade in meat, then nobody would work as a butcher.

Those practicing Right Livelihood would also not be meat importers, suppliers or retailers.

The first precept is not about vegetarianism, or any type of diet. It's about allowing sentient beings to live with ease.

However, if you observe the first precept, it is still ok to buy and consume meat that was frozen in the supermarket. The reason for this is that you did not have the intention to kill and in fact, you did not kill that animal.

You're simply buying frozen lifeless meat that was long dead before you arrived at the supermarket. Please also see this question for a detailed discussion on this topic .