But is anybody really thinking that BU is anything else but an "I don't want Segwit" thing, in other words "I want to keep bitcoin exactly as it is, but I want to make you think that I want also a "solution" for crashing the lucrative fee market" ?
For some people it's:
I want Bitcoin to split in two, so I can 'double' my coins!
I hate the censorship theymos is doing on his privately owned forums, therefore I am going to express my anger of this by supporting BU
I think the devs have full control over Bitcoin and I trust the miners more than I trust the devs, so I want miners to have the power to make economic policy.
Spot on. Even if the devs are corrupt, they're not naturally/inherently that way. Miners have a profit motive, so voting from miners is solely based around who has the most money to throw around for Bitcoin.
Core has been consistent enough not to cause a giant crash in the number of nodes being ran. Anyone committed enough to run a full node will have an understanding that alternative implementations exist, and yet most of them don't choose BU or other nodes, simply because Core comparatively know what they're doing.
BU's status as a kind of miner uprising is terrible. It's basically just miners hoping to increase the transaction capacity directly for profit who are terrified of offchain transactions to make microtransactions convenient or other solutions to actual problems in the protocol.