Yes it's pretty simple as most have pointed out. Cityjet are hiring type rated pilots to fly their 146's. It so happens that they are American. If the Turks or Chinese or the Aussies had plenty of surplus type rated pilots they would be hired too.
There is no unfairness, Cityjet is not a charity. It's a business. All airlines prefer type rated, experienced pilots. The only reason they take on low time non rated pilots is frankly because there aren't enough type rated pilots to go around. The IAA's job is to help ensure Cityjet stays in business by facilitating them.
As for criticising American airlines for not sponsoring pilots from abroad. Well why would they? Their mailboxes are crammed with resumes from appropriately experienced American and green carded pilots already. Why on earth would they need to trawl Europe for pilots? If there was ever a shortage of pilots in the US, you can be quite sure they would be holding recruitment seminars all over Europe.
It's also worth pointing out that the reason there are so many continental Europeans working for Irish and British carriers is because it's tough to get jobs in continental Europe even for the locals. On the other hand the British and Irish carriers take 'foreigners' because they need them. Ryanair of course being the classic example. In fact Ryanair only take type rated pilots if you think about it.
The airline business and aviation in general is and was always very international in it's employment policies. I think some people new to the business really don't realise this. Otherwise they wouldn't be making some of the stupid statements we see here.