Abortion are euthanasia are intrinsic moral evils, as is homosexual "marriage", never justifiable. Poverty, the environment and immigration are social ills, to be addressed and overcome by prudential measures that Catholics can legitimately disagree on. 

The sins that cry to heaven for vengeance: 
The "blood of Abel": homicide, infanticide, fratricide, parricide, and matricide;
The "sin of the Sodomites": pride, gluttony, negligence of the poor, abuse of children, and homosexual acts;
The "cry of the people oppressed in Egypt, the cry of the foreigner, the widow, and the orphan": slavery and unjust discrimination; and
The "injustice to the wage earner": taking advantage of and defrauding workers.