Have you seen many? You're hardly ever here in PL!
Anyway, Poland is old hat; the stag parties go elsewhere. Worth mentioning that the stag parties wouldn't have come at all if it weren't for specific adverts placed in bridal mags and 'lads mags' by Polish stag party organisers specifically encouraging them to come and making it very clear what's on offer,
they would get in trouble back in the UK
No, they wouldn't.
And Poles themselves have stag/hen parties too which are often even rowdier. Have you been down Nowy Świat or Chmielna on a Friday night lately?
So stop trolling.