Whether other countries choose to subsidise development in a particular industry is irrelevant, and if they choose to essentially export their money then that's up to them. It's not like there aren't plenty of other things these people could be doing. If you reach the level of China style product dumping then you have a trade war situation and things are different, but that's not (quite) what is going on here, though if Boeing or Airbus gained a monopoly it would sure look like that.

What is really happening is risks are socialised, profits (if any) are privatised.