you don't think there is even single-cell life anywhere else but Earth?

why would Earth be that incredibly unique?

it's even plausible Earth was accidentally seeded by panspermia (bacteria on comets)

Sorry, when you make an assertion, you don't get to demand I justify questioning it. You need to explain why I should believe you.

Your reversal of burden of proof is a red flag that you don't have a good argument.

IMO, it is quite plausible that OoL is extremely unlikely and that our solar system is the only place where life occurs in the visible universe. Not proved, of course, but the possibility is by no means unreasonable.