The likelihood the Senate will not do its job is not a reason to not do your job. Make them not do their job. Make them be seen not doing it. Don't not do their job for them. Don't normalize crime and corruption.
Telling the truth is worth doing even if it's unlikely to be believed.
Doing what's right is an end in itself.
Capitulation before the fact is what corrupt power wants. We should be absolutely opposed to giving it to them.