The problem is theft of your funds without your consent over your unpopular political speech. Bitcoin cannot be taken from you by any third party, provided you self-custody and adequately protect your keys.
>If I buy a video card with bitcoin, but get sent a brick instead, how does "Blockchain as Arbiter" get my bitcoins back?
Unrelated to the problem being discussed, but still a problem. Unfortunately, this is not a problem unique to Bitcoin, nor a problem adequately solved by PayPal, as explained in other comments, so it's hardly a robust criticism against BTC.
Full dislcosure: I own BTC, but less than 0.5% of my net worth, I do not own it for speculative reasons, and I do not view it as an investment or store of value, only as an alternative payment network.