But, wouldn't you? More importantly, shouldn't you? If the people in your government are doing something that is not in your best interest then you SHOULD speak up against it. After all, the word "representative" is based on the word "represent". If they are not representing my interests to the government then I should make that known.
If I have ailment X and a bill is being pushed that pulls funding/ assistance away from ailment X, then I should make it known that I am unhappy about it. What if it is now guaranteed that I will die from ailment X? You're saying that I shouldn't kick and yell about it? I'm about to die!
However, if it is also helps people with ailment Y, Z, I, J, K, and L, then it is the government's job to recognize that maybe I am less important to the bigger picture. If enough people will be negatively impacted to the point that I will not be reelected, then maybe it doesn't truly benefit my constituency as much as I think it will.
Of course all of this is in an ideal world without accounting for the power of advertisement funding and the fact that most of the voting population isn't well educated about the issues.