Obamacare is a symbol of what many Americans hate about the Obama years. Obamacare supports abortion and Planned Parenthood, and that offended many Americans who pay taxes. They retaliated against Obama by voting for Donald Trump.
The Silent Majority which voted in Donald Trump will be fiery mad if Obamacare is not repealed. People voted for Donald Trump in order to repeal Obamacare. That is what that American people who voted for Trump want.
If the Senate does not repeal Obamacare, then you can see the US Senators who are Republicans voted out in 2018 and 2020. The Silent Majority may be silent now, but they will be angry if the Republican Senators do not repeal Obamacare like they want, albeit in the silence of their homes.
There is an emotional hatred against Obamacare for Americans who voted for Donald Trump. It is an emotional issue. If Obamacare is not repealed then their anger against Obamacare will be transferred to Republican Senators.
Emotions matter. Obamacare must be repealed. That is what Trump voters want emotionally.
It is an emotional issue.