[strato-cumulus]

I'd agree that this mentality of "we don't need a trade union as IT workers" is pretty widespread, and it's not only a Polish thing - I've moved to Germany a long time ago and witnessed a works council being formed in the company I've been working for at the time. That company had a large IT department, but it was not an IT company per se and the basic workforce did unskilled labor. These were the people who initiated the process; some non-IT office staff joined the union, but I haven't heard of anyone working in IT who would take part in organizing a trade union. And this was in a country with presumably the strongest worker protection/union laws in the world.

The other thing the CEO mentioned in the email was mining industry unions - this is the prevalent view on unions in the eyes of non-unionized workforce in the country. This might be propaganda, but ask a Polish person what do they think of the coal miners and you will hear some expletives. It's common knowledge that the coal industry has long been unsustainable and the only reason it's being kept up is to gain some votes from that part of workforce.

An additional thing to know here is that the largest trade union is Solidarity, the direct successor to the original Solidarity trade union turned political movement which was the dominant force driving the democratic changes in the 80s. The movement is very politicized and heavily leans national-conservative (e.g. the official union newspaper basically reprints unfounded news and conspiracy theories), which further deepens societal divisions on the topic.