Why are liberals so afraid that Roe vs Wade will be overturned?

There are a lot of things that I disagree with your party on, that I never really thought would go anywhere. But after 8 years of spitting on our Constitution, I am wary of any Republican claiming that 'it won't happen'. I didn't think our governement would spy on us either....I didn't believe that they would hold innocent people against their will for years without trials or charges. I didn't think they would torture people and then pretend that it didn't matter or justify it with 'well, they would do the same to us'. We aren't them. We SHOULD BE and ARE supposed to be something far better....followers of freedom, liberty, and the rule of law. Call me crazy, but I just don't believe much that the GOP has to say concerning what they will and will not do.