  Given a saturated fusion system $\mathcal{F}$ over a $2$-group $S$, we prove
that $S$ is abelian provided any element of $S$ is $\mathcal{F}$-conjugate to
an element of $Z(S)$. This generalizes a Theorem of Camina--Herzog, leading to
a significant simplification of its proof. More importantly, it follows that
any $2$-block $B$ of a finite group has abelian defect groups if all
$B$-subsections are major. Furthermore, every $2$-block with a symmetric stable
center has abelian defect groups.
