But what does "cast it into the fire, destroy it" mean?

Swedish scenario:

• Before one election the far-right party declares liberalism the enemy, and the Liberal party responds with election slogans on them accepting the challenge
• next election the Liberal party join the side of the far-right, declare the far-right policies as liberal-actually, almost gets kicked out of Renew for being too fasc
• third election, in a little more than a week, it is not expected that they will remain in parliament, polling at 2-3.5% of the necessary 4%