GasparZizou
Super Freak
The stadium creates a giant barrier and is a deliberate show of the extent of Erik's power at a nationally-televised event. Could the writers have had Magneto do something different to achieve the same end? Of course, but it clearly flows organically from two specific needs in the plot and adds in a historical nod (RFK is now closed). The helicopter thing was just pointless and over-the-top.
That's a great point, I can't believe I missed Magneto's mediatic focus coming into play with that. :
Regarding Cap's scene, it doesn't hurt the plot nor it diminishes what I think it's a more relevantly charged theme, I rarely recriminate a comic book movie for going a little crazy.