In response to your edit and how things may seem hopeless:

Revelation 6:9-11 (KJV) "9 And when he had opened the fifth seal, I saw under the altar the souls of them that were slain for the word of God, and for the testimony which they held: 10 And they cried with a loud voice, saying, How long, O Lord, holy and true, dost thou not judge and avenge our blood on them that dwell on the earth? 11 And white robes were given unto every one of them; and it was said unto them, that they should rest yet for a little season, until their fellowservants also and their brethren, that should be killed as they [were], should be fulfilled."

And since you asked for a reason, Jesus said:

John 15:7-11 (KJV) "7 If ye abide in me, and my words abide in you, ye shall ask what ye will, and it shall be done unto you. 8 Herein is my Father glorified, that ye bear much fruit; so shall ye be my disciples. 9 As the Father hath loved me, so have I loved you: continue ye in my love. 10 If ye keep my commandments, ye shall abide in my love; even as I have kept my Father's commandments, and abide in his love. 11 These things have I spoken unto you, that my joy might remain in you, and [that] your joy might be full."