Joe Biden is committing grave scandal and leading many people to sin. The Catechism of the Catholic Church warns against scandal and against cooperating in and advancing mortal sin (CCC 2284-2286).
Paragraph 2287 says,
“Anyone who uses the power at his disposal in such a way that it leads others to do wrong becomes guilty of scandal and responsible for the evil that he has directly or indirectly encouraged. ‘Temptations to sin are sure to come; but woe to him by whom they come!’” (Luke 27:1)