Well yes, but technically it was somewhat reliable way to lure all remaining zombies with some big noise, and clear them out. That looked fun but still more or less justified.
As for what people said above, in total - i also can't say just from trial versions, what are they trying to achieve. They seems to making a lot of efforts for the game quality, but are making that in least effective way, like:
They make 4 characters with switchable options for party, but all the scenes are the same for all of them?
They make number of costumes for all the characters, but in all the scenes girls are naked, geez, even when enemy grab them during the battle - their clothes magically disappear, and then reappear once they are freed. Yes, it's made for the simplisity, but what's the need of costumes then? watch them walking back and forward at the base and running around during missions? etc.
So many questions... Yet i still hope that release version will positively surprise us