(I have revised and clarified my comments in this post as of 5:00 a.m. of Sept. 22, 2012)
There are many Catholics who cannot (for now) bring themselves to agree with the stance of the Catholic hierarchy on this issue and thus withhold their assent (at least for now) from the orthodox Catholic position on this matter. If they have a hard time giving their assent on this matter, then I hope that they would at least withhold it discreetly, with reverence for the Church and her hierarchy, and in a spirit of willingness to learn and understand the Church's reasons for the position that she has taken.
Withholding assent ("I cannot as yet agree with the Church on this matter but I am open to the possibility that she is right") is not the same as dissent ("I disagree with the Church on this matter and I think she is wrong"). Unfortunately, many Catholics seem to be unaware of this difference, such that if they have difficulties understanding the Church's position, they immediately think that this means that they should reject that position. It is a rejection that is commonly expressed by lashing out against the Church and declaring her to be in error, as if a position is wrong simply because it is not easy to understand. Withholding assent also properly entails not condemning the Church's position in public, and airing one's difficulties with her position only in a manner that avoids scandalizing the faithful.
(What I am discussing here is the situation of those Catholics who find themselves privately opposed to, or unconvinced by, the public positions taken by the Church hierarchy on doctrinal grounds. This is not the place to discuss the situation of those who, precisely in the name of Catholic orthodoxy and doctrine, oppose the real or perceived compromise of some official representatives of the Church with heterodoxy.)
If you had a disagreement with your mother, would you broadcast it to the world that your mother was wrong?
Would you call your mother ignorant, stupid, out of touch, not all there?
Would you post it on your Facebook page that she’s a self-righteous hypocrite?
Would you tweet that you’re declaring an all-out war on her?