It's a free country and everybody is entitled to their opinions. I respect yours and if you don't think you could cope with a disabled child, then that is your choice to make. You're right, I don't agree with abortion, but that is just my belief, as you are entitled to yours. I'm sure you would love your child whether it happened to be disabled or not, once you had it in your arms, but if you don't think you could love it as much, you're right, it wouldn't be fair and perhaps it would be better to be forewarned and then decide then.
Just bear in mind, no test is 100% accurate and I have heard stories of women aborting perfectly healthy babies when tests had told them otherwise.
Anyway, of course we can agree to disagree - that's what makes the world go round, lol. Good luck with your pregnancy and I wish you well for the future.