Fear God. Why? (Is god wrong again?)

Deuteronomy 6:2 says, “That thou mightest fear the LORD thy God, to keep all his statutes and his commandments, which I command thee, thou, and thy son, and thy son's son, all the days of thy life; and that thy days may be prolonged.”  Why do we need to fear a loving god?  Shouldn’t we just fall in love with him right from the get go if he is perfect and good.  I fall for the Disney princesses every time.  And as for long.  I know a lot of christians who are cut down in the prime of their lives.  I also know Atheists who live very long lives.  Is god wrong again?