No, it can only be concluded that, although the Church before Vatican II seemed healthy, there was a good deal of rot hidden away already, or it would not have burst forth so enthusiastically.
Only schismatic groups like the Society of Pius X believe that Vatican II was evil. The real evil was that dissenters and people who in the old days would have been called heretics "seized the levers of power." Nothing in Vatican II authorized any of this mess. The Church was victimized by the whole 60s Counter-Cultural Revolution, which has seized and perverted every other institution and aspect of western culture. It didn't take Vatican II to produce Bill Clinton, to wreck our universities, to eviscerate or destroy many Protestant denominations, and to pervert the media.
"Vatican II" has been a code word for all the dismal things that have happened in the Church, but the council itself was not responsible. Liberal dissenters who misrepresented the council for their own purposes were responsible.
There is a lot of truth in this statement. If the Church were to simply adhere to what was acutally decided at Vatican II, it would be a vastly better Church today than it is. The thing is, Vatican II allowed for a bit of freedom - and then people ran far, far, far with it. It's time to reel them in.