Facts do not produce absurd conclusions without a bit of bias...and yours is on display for all to see.
The facts are that if the 14 Senators from the seceding States had remained in the Senate, the Morrill Tariff Act would have been voted down. The President of the Senate, John C. Breckenridge, would not have had to cast the deciding vote on March 2 1861.
Is the conclusion absurd?