The negative reactions might be because your wording, to me, is a bit flame batey, as if this is a given negative.

As for non-EU manufacturer being able to invest in production equipment Europe might need if push come to shove on places not easily destroyed by the assumed enemy producing European designs? And in the process incentivise other countries to buy non-american equipment?

If a good chunk of the global military complex seems about to change supplier, I'd bet big on getting to be picked as the supplier of choice!