You're living in a fantasyland created in Nowogrodzka.
It is enough if they bring disruption and make the EU core weaken its grip.
Don't you realise that they are the EU core? The EU isn't some creation of France and Germany, it's a union of all 28 member states who each influence it. Italy won't weaken the EU, but will bend the EU in its favour - which means Poland loses. We've already seen how Italy along with Spain have pushed the EU to divert funds south rather than east - how are they any sort of ally?
The real reason why there's an attack on Poland is that Poland on the rise and it represents values which are 'unacceptable'
Seriously, you could try and not regurgitate exactly what gets published in magazines controlled by PiS. Poland's rise is almost completely because of foreign companies, and if they decide to leave, Poland is back to the early 2000's with the 20% unemployment rate. There's nothing particularly special in Poland, Romania is comparable and has cheaper workers. What has Poland got domestically? It's relying on importing Donbas coal, the IT sector is filled with foreigners who can easily relocate, and what else? Nothing.
Poland will bend and break because there's no alternative. Patriotism is just a fashionable slogan at the minute and means nothing in every day lives, conservatism lost badly in almost every Polish city of any note, and religion? It means nothing and attendance at mass is declining more and more.
All this PiS-promoted arrogance won't get Poland anywhere, except into the hands of Moscow.