Imma real talk y'all for a second:
I shied away from joining this community for YEARS because of how often I heard "****" used (it's gotten a lot better, I have to say); anybody saying that the word use doesn't affect community growth needs to realize that language is a powerful pursuasive tool, and it plays a big role in how others view you. It frankly does say something about the person that says it, regardless of the context, and it certainly says something about the people that condone it and act like it isn't a big deal. It's plainly a disgusting word, and it's no different from any slurs; there's context for these sorts of things, and to take it out of the context is to do injustice to the context (that means you're undermining the severity of ****, effectually returning acceptance of it). That's a big reason why the N word isn't supposed to be used by white people: it reinforces a negligent attitude toward the subject that then makes it seem "okay" to do it (if just on a subconscious level, though I'd argue it's a bit more than that). The same can be said for murder and suicide, as others have stated: the fact is that you're not murdering someone, and whatever it is you're doing in smash, it's nothing compared to murder (so stop minimizing murder by doing so). The fact that so many people have the attitude "it's not even a big deal" makes all this even more evident. I say all of this as someone completely unaffected by ****: no victim mothers, daughters, sisters, brothers, or anything. It's no personal matter for me, but I still can't get behind it and call it okay or ignore it.
Now I'm gonna take an linguistic perspective here and talk about why "kirbycide" is fine: it's not "suicide," it's a "kirbycide," and any word ending with the -cide suffix literally means "to kill." That's where homicide (to kill the same), suicide (to kill the self), and regicide (to kill the king) all come from. Therefore, a kirbycide is to kill the kirby (way), ergo NOT the same as suicide. As for "gimp," that's an example of anthimeria: we've adapted the noun "gimp" (which refers a disabled person*) and applied it to a verb setting of "gimp" (where you impede on someone's recovery) and thereby drastically change what the word signifies to the point that it takes on an entirely new meaning. This is different from using "****" in reference to an action ("Sheik ***** Falcon") because it's the verb for the verb, and therefore there's a lesser degree of difference there that's subtly less acceptable. At best, it's a metaphor, and a poor one at that. Words like destroy, decimate, et al are similarly acceptable in that they're related to murder, but they're not murder (because again: you're not murdering). And I realize that you're not "literally" ****** people while you're playing smash (at least, I hope not), but again: it's a poor metaphor that degrades the trauma surrounding your source material by applying it to a frankly unsubstantial act in a video game—foster your creativity some! (read some of the suggestions in this thread again! There's some gold here)
*which I honestly wasn't even aware of: BDSM and photo manipulation programs came to mind first.
I understand that languages evolve and to try and put limitations on that evolution is silly, but there's still contexts that need to be regarded: there are words you simply should not use in certain situations. You wouldn't tell your customer to have a "great ****ing day," would you? You wouldn't use homophobic slurs with your gay friend, would you? You don't use slang and txt shorthand in scholarly works, do you? It's the same here: why would you use **** (even as a metaphor) in a context where thousands of people (many likely more affected by it than you or me) will hear what you say? It's unprofessional, and that's the core issue here; there's a contextual expectation that's garnered, and Boss broke that expectation and get reprimanded for it. Cut and dried. I love hearing the guy's commentary, and Iove watching him play, but that gaff was pretty big, and to deny that is just silly. Say what you will where the context is right (in your basement or living room or wherever your buds and you play) but when you get into this kind of a spotlight, don't expect this coarse language to fly.