Not really. US taxes aren't that much lower than Europe.
The reason is supply/demand. There's the lack of VC funding and also due to the market size, European tech companies don't generate nearly as much value as the US ones and the few ones that do don't have any meaningful competition so there's no need to pay high salaries.
Take the US defense sector alone. That's generating so many high paying tech and consultancy jobs that EU employees couldn't even dream of.
