If you are an idealist, you believe in bitcoin because it is removing the governments from the money printers, or at least it's supposed to try to do so.
In reality, most flocked to bitcoin to get rich. True libertarian rebels are few ...
Then Altcoins came and kept coming ...
If you are a bitcoin hardliner, possibly focused on a small aspect, and do not see the whole picture, happy with your stach, and want the rest to run after satoshis ... You probably hate altcoins.
Bitcoin needs Altcoins, because people need to believe they can back another bitcoin, without this believe the crypto marketcap would have been a tiny fraction of what it is today.
Altcoins need bitcoin, because it is the brand that regroup them all, the name that promotes them all.
The crypto ecosystem is one, and if you fail to realise that, it means your heart was not in the right place to begin with.