It’s a popular view of anti union propaganda. No one wants to work with lazy people and unions don’t especially want them either
Anyone that has ever participated in a trade show at the Javits Center, has seen unions do serious damage to their own cause.
Plenty of stories of presenters being disallowed from plugging in their own equipment without a union employee there to assist and other things like that.
They put her purse onto the center of the cart, and escorted her to the booth. Then, they got upset she only tipped one guy $5.
I know these are "one-off" stories (and she probably gave attitude), but there's so many of these anecdotes, that it causes huge damage.
Your understanding of the world isn't workable when you think tens of thousands of people are acting as unhinged mass murderers and society just accepts it.