The answer to that question is in the article:
“Catholic moral teaching acknowledges that not all issues have the same moral weight.”
You brought up abortion. Abortion is an intrinsic evil. Supporting abortion is a mortal sin.
We could go down the whole list of vices and have a discussion regarding whether or not a prohibition of each one should be codified into law.
Personally, I think adultery should be illegal, given the damage it does to families and by extension, society. This issue was important enough to God that He made its prohibition one of our 10 Commandments.
I think it is unwise to defy the Big Guy on any issue He has specifically weighed in on. The down side could be eternal damnation.
“Catholic moral teaching acknowledges that not all issues have the same moral weight.”
I addressed that by acknowledging it may not be a mortal sin, but to be consistent you must admit not fighting for anti-adultery laws is sinful.
Supporting abortion is a mortal sin.
No one is talking about supporting abortion. I'm talking about someone who actively rejects abortion and works to minimize its occurrence.
You say if that person doesn't also push the state to outlaw abortion they're committing a mortal sin.
I just want to know what other anti-sin laws we need to fight for in order not to be sinful.
I appreciate you think abortion is a special case but we're not talking about the morality of the act. We're talking about the morality of not engaging in a political fight.
And when we start threatening peoples souls, not for supporting an immoral act but for being insufficiently politically active to make government stop it, I think we're off the path.