Yes, they are that stupid.
...[U]nions have historically fulfilled an important social role of helping to manage larger conflicts between socioeconomic classes in a manner that has benefited society as a whole.
Few now alive recall the turmoil, violence, bloodshed and destruction of property that took place before collective bargaining was made legal in the United States, as labor fought tooth and nail for its share of the economic benefits of its efforts.
Yet it did happen, and unions have served a socially desirable role of helping to manage the inevitable conflicts between the wealthy owners of property and those employed by them, thereby minimizing disruptions of the economy.
Undermining the legitimacy of collective bargaining now threatens to return us to something like the previous status quo, at the sacrifice of domestic peace in civil society.
Are the libertarians and conservatives prepared to sacrifice the peace and return to open warfare between the classes in the United States?
Are they so stupid they fail to understand that if collective bargaining is taken away from the working classes, they will certainly find ways to disrupt the idle holidays of the wealthy among us?
In my humble opinion.