Bitcoin leads them instead. There is no way that bitcoin should have to kill altcoins knowing he’s already on the top of them. If there are coins that would aim to kill the other coin, it would be altcoins killing bitcoin because they want to compete with it and replace its tops position.

However, we all know that altcoins easily die because they aren’t good enough. Because they can’t compete with bitcoin no matter what. And the fact that hundreds or thousands of altcoins have been developed every single day, then it’s normal to see other altcoins dying at first.