In an era where cyber and physical threats increasingly intersect, the traditional separation between IT, operational technology, and physical security has become a critical vulnerability for infrastructure operators. Security convergence offers a necessary shift, unifying these domains to provide real-time visibility, faster response, and stronger resilience against sophisticated, multi-vector attacks. As incidents like the Oldsmar water treatment breach demonstrate, attackers exploit gaps between systems—not weaknesses within them alone—making integrated security not just advantageous, but essential. Organizations that align technology, governance, and culture around a converged approach will be far better positioned to protect the systems that underpin modern society.