Strong CP violation: Problem or blessing?

We readdress the issue of strong CP violation both in Standard Model (SM) and Minimal Left–Right (LR) Symmetric try to clear confusion that seems still pervade field. argue smallness violation, while harmless basically decoupled from rest physics SM, context LR symmetry provides a blessing by helping narrow down parameter space theory connecting apparently uncorrelated physical quantities. In particular, left–right being parity, it either points suppression leptonic noticed before, or leads relatively light right-handed neutrinos, potentially accessible at next hadron collider. The latter, more natural view complex quark Yukawa couplings, goes hand with lepton flavor enhances possibility observing neutrinoless double-beta decay.