Don't be. I'm neither American nor European, and from my vantage point this is far less America's (US) fault than it is Western Europe's. US has been asking Europe to increase defense spending for years now, and at the beginning of the war it was below 2% (Germany was spending 1.25% in 2018). Trump said this very publicly in during his first term, and he was ignored and mostly ridiculed. Same thing with the Gazprom deal.
Europe's defence should not be entirely on the American tax payer.