You want they should take an IQ test??
No, not a test. What I had envisioned is somewhere in the text of terms and conditions it saying something like, if you agree with these terms and conditions, click on the green button below. I don't think it is a bad thing for a site like this one to ensure that those who are joining know what it is all about - which I will get to in a moment. I am not suggesting new registrants be forced to read anything beyond that, but should be made aware, for their own benefit, that there are some things they may wish to educate themselves on depending on what specific interest prompted them to join in the first place. Even something as simple as "you are strongly encouraged to read the Best of Topics threads" (which is already labeled the "First stop for new visitors", after all.)
As to the other comments, I can agree to all of your points. A site like this one holds out different values to different people. As to agenda, it appears to me that what it is not speaks more loudly than what it otherwise might be - it is not a site that generally supports the legitimacy of the WTBTS and when one reads the Best of Topics threads that is clearly understood.
Finally, I do not see the fiasco of 1975 as a theological subject at all. I see it as a key issue of credibility that goes to the much larger question of the legitimacy of a Society and what it claims to be. The fact that 1975 has become a non-issue to so many, and that so many aren't even aware that it happened, is mute testimony to the efficiency with which the WTBTS has been able to sweep it, and other facts that reflect badly upon it, under the carpet.