There are some “criminals” and criminal gangs and such, but I think the increase we have seen is due to Russia, Iran, and others who are giving extra resources and intelligence to some of these groups to deprive western institutions of their cultural heritage as part of the “hybrid war”.

Notice how things aren’t being stolen at this magnitude in China? Japan? If we’re Russian or Iranian for example I think this would be a great strategy if you view yourself at a civilizational war. Most of Europe is still asleep or in denial.