I can certainly sympathize with those that have not gotten any acceptances yet. But the whole admissions process is really pretty messed up for all of us.
I have gotten two acceptances at one safe school and one medium. Rejected at 5 others, waitlisted at 1, and awaiting decisions from 4 more. I am currently trying to choose between the two, as the safe has offered me an excellent full funding package and medium has offered me basically nothing (a stipend I couldn't possibly live off of as a GA and limited tuition remission). After campus visits next week and the week after, I'll decline one, but the complexity comes in the offers or rejections that I may get in between. At this point, it wouldn't make sense for me to let go of a school (even if it is my safety) because that's what a safety is for. Further, unless its your top school, its not even in your best interest to decline offers, especially since no one has to until April 15th. No one will know immediately whether they want to accept or not, and it would be counterproductive to do so without visiting the school and careful deliberation (especially when the funding packages are different). I'd rather go to the school I am being waitlisted at, but I am sure there are people there holding offers that are waiting for schools they'd rather be going to, or they are deciding between two or more also. I'm more irritated with the schools, who either formally (notifying you) or informally (making you wait with no response) waitlist possibly hundreds of applicants, not the applicants themselves.
All that to say: Those holding on to schools are likely doing it for a reason, and it is a big stressful decision to have to choose between two or more schools.
But I'll also say, someone choosing between Princeton, Yale, and UC Berkeley and holding on to all three offers until April 15th is a piss off.