I didn’t compare all sinful acts, I specifically compared abortion with murder of innocents. The former is a subset of the latter within Catholic teaching (an aborted embryo is an innocent person, excepting of course original sin - with discomforting implications, as an aborted embryo is not baptized).
I have strong authorities at the ready,
“Human life must be respected and protected absolutely from the moment of conception. From the first moment of his existence, a human being must be recognized as having the rights of a person - among which is the inviolable right of every innocent being to life.” ~ Catechism of the Catholic Church , paragraph 2270.
"The inalienable right to life of every innocent human individual is a constitutive element of a civil society and its legislation:
‘The inalienable rights of the person must be recognized and respected by civil society and the political authority. These human rights depend neither on single individuals nor on parents; nor do they represent a concession made by society and the state; they belong to human nature and are inherent in the person by virtue of the creative act from which the person took his origin. Among such fundamental rights one should mention in this regard every human being’s right to life and physical integrity from the moment of conception until death.’
‘The moment a positive law deprives a category of human beings of the protection which civil legislation ought to accord them, the state is denying the equality of all before the law. When the state does not place its power at the service of the rights of each citizen, and in particular of the more vulnerable, the very foundations of a state based on law are undermined… As a consequence of the respect and protection which must be ensured for the unborn child from the moment of conception, the law must provide appropriate penal sanctions for every deliberate violation of the child’s rights.’"
~ Catechism of the Catholic Church , paragraph 2273