I think this should be obvious, but burning a factory down is fundamentally different from hiring agreements, in that it is destruction of someone elses property. A hiring agreement does not involve the destruction or restriction of property, but laws against such agreements do.
> To collude to deny others the right of free association and free employment is just as wrong.
Hiring agreements do not deny anyone the right of free association or free employment. Employment is a free exchange between the employee and the employer. Not coming to an agreement (not offering you a job) in no way is a restriction of your right to make an agreement in the first place. If I don't want to work with you, that doesn't restrict your right to form an agreement with me or with someone else.
> The CEOs of major corporations that dominate an industry can have a disproportionate impact on an industry
I don't see how that's relevant to the fact that laws against hiring agreements are laws against free association.