It just seems to me that people are going to be people, and are going to disagree with some things. Why is it completely impossible to be a Catholic and still at least see the argument in some things, such as abortion?
There's no way that every Catholic agrees and believes in every single thing they're taught; at some point in life, you start to reason things out for yourself and come to your own conclusions. That goes for every religion. There are plenty of Muslims out there (particularly in the States) that drink and eat pork, for example, but I don't think they necessarily consider themselves any less of believers. I'm pretty sure there are a lot of liberals out there that attach themselves to a certain religion, including Catholicism.