I don't think people are objecting to allowing women to make an informed decision, they're objecting to the government interference in her decision. Yes, it is probably for the best she see the ultrasound before the abortion, but it shouldn't be mandatory or forced on her. It is up to her to be informed before making her decision, the government can't enforce this. You could argue the same that there be government programs to educate all individuals before undergoing any surgery, but the cost would be astronomical and the logistics impossible. You also have to consider that the untrained individual really isn't getting informed about anything when they see an ultrasound because they can't tell the butt from the head. Also, given that most abortions occur during an embryonic state when the embryo is just a fraction of an inch in size and doesn't resemble anything human, she's not seeing much at all.
The issue really comes down to freedom of choice and freedom from government interference. If a woman wants to see the ultrasound she can ask to see it. If she chooses to be misinformed, ignorant or just doesn't want to see it, that is her choice to make.