Whoa, guys guys guys...
I think what we're really missing here is the fact that space magic exists, hyperdrive exists, fighters act like they do in atmosphere, in space for... Some reason.
Come on dudes lasers are our least bit of concern. Who cares what actually really does what in real life? These things fire tibanna gas bolts at each other.
C'mon guys, nuff said.
Lasers and engines make sounds in space. In fact, there is orchestra music in space.