Because I would like those office holders to stay in office. I think on this issue at this time, because of how it can be spun, there is a better way to handle it and still achieve a desirable result.
I grok the sentiment.
The senate doesn't show lots of stamina for these sorts of fights. Announce hearings, and institutional momentum will push Garland to a wider senate vote. If you think the current situation is ugly, wait to see what is heaped on your favorite senators once they've voted against appointment.