We all know that the easiest solutions are always the best, and deleting the files for Neutralizer would be even easier than changing a single line of code. You don't even need to do any typing, just easy and simple mouse clicking. So why haven't you done it yet?
Because, first, off, it's not the only useless weapon atm and they'd need to treat all useless weapons equally then and delete them all.
And then second because they'd need to reimburse everyone with them, because everyone who has one would have lost something.
And because they have done weapon buffs in the past for specific weapons, so they should just do that again. (Magnus for example, which was a bit overkill though since it went from one of the worst to one of the best, if not the best.) They could do something like increasing damage to a reasonable amount, ie, higher than other guns since it needs to be activated and is easy to overkill with (except for stupidly low damage) and because shots on stuff that gets killed are lost, maybe make the charge attack pierce enemies so you can actually activate those that somehow are now behind other enemies.