Brahmanas are the symbol of spiritual education, and cows are the symbol of the most valuable food (milk production & Butter); they must be given all protection.. that is real advancement of civilization.
Lord can protect one from the most dangerous type of fear.
A devotee of the Lord is always fearless because of the protection given by the Lord.
A devotee knows that even at his death Krishna will protect him. The real test of our devotion will be at that time.
If God wants to kill somebody, nobody can protect him and if God wants to protect him, nobody can kill him.
The Lord protects everyone, but one who depends completely upon Him is especially looked after by the Lord.
Srimad Bhagavatam 1.8.8,
Srila Prabhupada