Trev,
The arguments you are making are the ones that we all go through at some time or another and it's good you are asking yourself these questions.
I don't recall you saying how old you were when you were abused, but as I am sure you know, a guy's teen years are full of a million changes, mainly maturing in all sorts of ways. These changes can make a lot of difference in a short time. For example, two kids may be friends if one is 9 and the other is 12, but if one is 16 and the other is 13 that's a big difference and in a lot more than years!
My point here, Trev, is that at 16 you may not understand that only a few years ago there is no way you could have seen or made choices that now strike you as obvious. That's what happened to me, for example. My abuse ended at age 14, and I looked back and wondered why didn't I run, or say no, or a million other things, when the abuse began when I was 11. I didn't understand that an 11 yo will just freeze, exactly as I did. His first reaction will be fear and confusion, and if he knows the abuser he may trust him when he says "this is our secret". Later on, sure, he will look back and see the abuser was a bastard, but that wasn't information he had from the start.
I also don't know how long you were abused for. But I can tell you that with time an abused boy comes to think that what is happening is his fault and it means he is worthless. Once he starts thinking like that, resistance just isn't worth the effort. Again, that's how it was with me. I just did what I was told and went with him without the slightest question.
All this is really complicated and you will see it more clearly in time, but here on MS you will get one basic truth over and over again: It is NEVER the kid's fault.
Much love,
Larry