I'm perfectly happy interviewing people for junior positions. We did this quite a bit at larger companies where junior engineers were desirable, and there was structure that let them succeed.
But when I'm dealing with a professional organization that is basically trying to scam my company into doing mis-hires, that's when my empathy goes dry. I have a duty to my co-workers and my investors to not screw up hires. I see gaming the system as a legitimate opportunity to criticize someone else's behavior.
I agree, these junior level people are in a tough position. They're being mis-represented and taken advantage of. It sucks. I want people to succeed. But I don't do handouts, and the practices I've seen make me mad.
Everyone in this industry sees many, many resumes from people who cannot do the job. Everyone interviews people who don't pass. Probably everyone has seen people fired because they couldn't perform or were doing damage. This happens. It's not going away. And it's not pleasant.
So while it might not come across in what I wrote above, every time I affect someone's life like this -- every time I send a "Sorry, we're not going to proceed" email, or tell someone in an interview that we're cutting things short today -- I feel bad about it. Sometimes a little bad, sometimes a lot. Sometimes I agonize over a resume (and we spent quite a bit of time on a candidate the other day, trying to come up with reasons to proceed). But the alternatives (job charity? keeping someone on who does negative work?) are worse. Much worse.
And given all the people who should be given a chance, I won't countenance fraud. That makes me write responses that are direct and forceful and unapologetic. These job shops are poisoning the well for the individuals who are truly deserving, and that should make everyone mad.