How to explain to people the importance of p2p transactions and the difference to custodial transactions?

Every once in a while I come to a point where I feel like I'm in the Truman Show and people are directed to not get the easy to understand facts. I have tried many approaches but it seems that todays crypto crowd is especially of the type of people that don't get it until it happens to them.

Many seem to think, if they have their wealth in a special UNIT they are golden, completely oblivious to the custodial/non-custodial difference and why a network like Bitcoin needs to scale to be successful.

So, share with me your approaches how you explain to people why we need p2p transactions for everyone and why scale matters.