If you're taking the time to write one or more posts about this, you are implicitly against language growth, you've just found a justification for being against it that you find acceptable to your worldview.
Yes, there are occasions where I would take exception to language evolution. If we entered a pattern of 1984-era newspeak I'd take exception there as well. I think it is usually the product of a poorly considered stance for one to be an absolutist about the vast majority things.
Euphemism is already common, particularly when discussing sensitive topics like the cycle of life, bodily functions, etc. You are probably okay with many existing euphemisms because they are familiar. This really isn't a social media thing, newspaper obituaries also use euphemisms for death. e.g. "passed away", "departed", "eternal rest", etc.
Yes, because that euphemistic language is there to lighten the blow. "unalive" is an attempt to bypass a social media filter and speaks to the shift in how and why words enter our lexicon.
Well, because "suicide" isn't profane. It might be considered a pseudo-profanity, but people don't stop saying swearing because of profanity filters. This is an instance where the filter is feeding back into the zeitgeist.