I consider myself to be a pretty reasonable person and I think the value in something like Bitcoin is as a backup or alternative to the traditional system. Similar to how someone would invest in gold. Except Bitcoin is much easier to transfer, requires much less space to store, etc., vs gold. I think 95% of crypto is bullshit though, and there are a lot of scams.
If you look at recent bank collapses, high inflation, etc., I think a reasonable person might question how long modern monetary theory can go on like this. I'm not a gloom and doom person. I still hold fiat, haven't given up on banks, still invest in US treasuries, stocks, etc. But I think holding some in crypto and gold, etc., also makes sense.