Then you commit to never voting. If you vote for Bernie people will say “oh he endorsed joe biden, he is complicit” but you don’t get to choose the battlefield only the outcome of the battle.
Fundamentally a percentage of politicians will lie, or lack resources to fulfil promises. There is simply nobody on earth that can uphold the promise of never doing something terrible, even on accident.
Scott Adams said republicans would be executed if Joe Biden won. Can we just agree Trump and all his MAGA morons are liars who will say and do anything for a lick of power?