Why do people think the Bible needs to be explained?

I was talking to someone tonight about the Bible and prophecies and I asked about a specific prophecy that I could not see how it was supposed to be a prophecy.

The trouble was with the first of a long list of prophecies that I took a look at -

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PROPHECY FULFILLED: Forsaken by His Disciples
PROPHECY: ZEC 13:7
FULFILLMENT: MAR 14:50
Zechariah 13:7 "Awake, O sword, against My Shepherd, And against the man, My Associate," Declares the Lord of hosts. "Strike the Shepherd that the sheep may be scattered; And I will turn My hand against the little ones.
Mark 14:50 And they all left Him and fled.
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I questioned the assumption that Zechariah 13 was a reference to Jesus. If you read the whole of Zechariah 13 it is...

King James Version: Zechariah Chapter 13

1 In that day there shall be a fountain opened to the house of David and to the inhabitants of Jerusalem for sin and for uncleanness.

2 And it shall come to pass in that day, saith the LORD of hosts, that I will cut off the names of the idols out of the land, and they shall no more be remembered: and also I will cause the prophets and the unclean spirit to pass out of the land.

3 And it shall come to pass, that when any shall yet prophesy, then his father and his mother that begat him shall say unto him, Thou shalt not live; for thou speakest lies in the name of the LORD: and his father and his mother that begat him shall thrust him through when he prophesieth.

4 And it shall come to pass in that day, that the prophets shall be ashamed every one of his vision, when he hath prophesied; neither shall they wear a rough garment to deceive:

5 But he shall say, I am no prophet, I am an husbandman; for man taught me to keep cattle from my youth.

6 And one shall say unto him, What are these wounds in thine hands? Then he shall answer, Those with which I was wounded in the house of my friends.

7 Awake, O sword, against my shepherd, and against the man that is my fellow, saith the LORD of hosts: smite the shepherd, and the sheep shall be scattered: and I will turn mine hand upon the little ones.

8 And it shall come to pass, that in all the land, saith the LORD, two parts therein shall be cut off and die; but the third shall be left therein.

9 And I will bring the third part through the fire, and will refine them as silver is refined, and will try them as gold is tried: they shall call on my name, and I will hear them: I will say, It is my people: and they shall say, The LORD is my God.

Zechariah 13 is about prophets being killed by those who know them. So, how is it specifically a prediction about Jesus being betrayed?

After talking back and forth I was told that I refused to accept what Zechariah 13:7 said, and my reply was:

No, I did not refuse to accept what it said. I read what it said and refused to let anyone say "if you SQUINT and look through this colorful kaleidoscope at noon on a Sunday, reading it backwards and in connection to this and this and this- ignore that they are not connected other than via my saying they are... then it can be read in THIS way, and THAT is how it is to be read... forget what it says and read what *I* say it says."

So, I ask... why is it that those who live their lives by the Bible get upset and say those of us who do not blindly believe every word we are told are unable to understand it? Does it really make more sense that it would be a giant cryptogram? Does it actually make any sense for the thing to be next to impossible to be understood without making wild leaps in logic about what it is saying?

Could it be that what it says is actually what it says and the extravagant manipulations are not necessary for a person to understand the meaning of the Bible?Why can it not stand on the weight of its own words without having them "interpreted"?