The compassinate great man

Sometimes We can see someone who are not vegetarians  but they can change overnight because of the compassion pouring out from their heart. But most people their compassion is hidden forever until his last day in this life. These uncompassionate people doing all the killing job but expect other people compassionate towards them, I think it is unlikely and of course they will be killed sooner or later.
Let's see the compassion story here. The compassinate great man

Buddha : Ten attainment

In our practice, we strive to attain:

True sincerity
towards others,
Purity of mind
within,
impartiality
towards everything we see,
proper understanding
of life and the universe, and
Compassion
in helping others in a wise unconditional way.
In attaining these, we will
See through
to the truth of impermanence,
Let go
of all wandering thoughts and attachments,
Attain freedom
of mind and spirit,
Accord with proper conditions
to get along with the situation, and
Be mindful of Amitabha Buddha,
follow his teachings,
and vow to reach the Western Pure Land.

Buddha : The ten vows

Only when we have applied the first four of the five guidelines: the Three Conditions, the Six Harmonies, the Threefold Learning, and the Six Paramitas, will we truly be a student of the Buddha and be close to Bodhisattvas. Based on the foundation of the Six Paramitas, we can progress to the next level of our practice, which is comprised of the Ten Great Vows of Samantabhadra Bodhisattva.

These vows were taught to us by the Buddha in the Avatamsaka Sutra. This is the last stage of our cultivation leading to Buddhahood. We cannot practice the Six Paramitas and advance to the Ten Great Vows until we have fulfilled the first four guidelines. The main characteristic of Samantabhadra Bodhisattva is an immeasurably broad and compassionate heart. Every one of his vows is complete and perfect.
The Ten Great Vows of Samantabhadra are:
1. To respect all Buddhas
2. To praise Tathagata (one of the ten names for Buddha)
3. To make offerings extensively
4. To repent karmic obstacles
5. To rejoice at other’s meritorious deeds
6. To request the turning of the Dharma wheel
7. To request the Buddha to remain in this world
8. To constantly follow the Buddha’s teachings
9. To accommodate all sentient beings, and
10. To dedicate all merits universally
The distinctive feature of the practice of Samantabhadra is that this bodhisattva has a mind as broad as the universe. As a result, each of his ten vows is ultimate and perfect in itself.

Buddha : Six Paramitas

To interact successfully with others, the Buddha taught us the Six Paramitas, or Perfections. The fourth of the Five Guidelines, the paramitas are the practices of bodhisattvas.

The Six Paramitas are:
1. Giving (dana)
2. Precept observation (shila)
3. Patience (kshanti)
4. Diligence (virya)
5. Meditative concentration (dhyana)
6. Wisdom (prajna)
The first paramita is giving. Giving counters greed, and ensures that in the future we will have ample resources to continue helping others. The underlying meaning of giving is letting go.
Second is the giving of teaching. By teaching others, we are helping them to learn how to rely more on themselves. We give material resources to try to solve immediate needs. But, if we want to solve needs that are more far-reaching, we teach.
Third is the giving of fearlessness. It is to remove the insecurities, worries, and fears of others, whether the “other” is human or non-human.
Fourth is diligence, or enthusiastic effort. It is the joy that we bring to our practice and to all that is worthwhile in our lives. It is the true delight that arises from deep within us when we are doing what is wholesome. It enables us to keep going when we feel tired or overwhelmed. It is refreshing and inspiring. Cultivating enthusiastic effort counters laziness.
The fifth perfection is meditative concentration. Our practice and training in discipline and not harming others will reduce and gradually eliminate our harmful verbal and physical behaviors. Our minds will become calmer and less agitated. When our minds are thus settled, we will be better able to concentrate.
The sixth paramita is wisdom. Wisdom counters ignorance, and enables us to know how best to help others and to improve ourselves, including our ability to get along well with others. This wisdom is not that which is gained through intense study and analysis of many diverse subjects. That would be seeking wisdom from external sources. It is our innate, all-knowing wisdom.