The most important reason for HR to support social responsibility activities is to:

A strategic CSR program improves the organization's reputation as anethical employer, strengthensbrand equity, andattracts values-aligned talent. This is especially impactful in competitive labor markets.

Extract from HRCI-aligned HR knowledge (Leadership and Strategy):

SPHR-level guidance includes “integrating CSR with employer branding and talent strategy.” CSR buildsemployer reputation, aligns with stakeholder values, and is acompetitive advantagein global talent acquisition.