Bitcoin was already in existence before all these other altcoins were created. It’s something that’s just there, and some of them actually have a purpose for why they were created. Bitcoin is not there to kill any of them; altcoins are in competition with one another and not with Bitcoin. Meme coins are even the worst to invest in, as there is no special something about them, unless it is just to pump and dump.
Some alts don't search to destroy others too - they all chase goals and usually they don't interfere with each other like that, people just love comparing and doing that stuff because it makes good headlines and overall is a good narrative to push for to spike the minds up.
You are also correct, but if we look at most of the projects out there and their pattern, you will notice that what they usually talk about is making something better. Where they think a particular network is not doing fine, they offer a better service, like in terms of fees, fastness, and many others. This is one of the reasons why we have so many smart chains and layer 2 projects because they want to make things better.