A few reasons:
1) Some libs were also involved with Epstein and they were willing to let Trump get away if it meant protecting themselves. I am not a liberal, I hate liberals more than you do, so I'm perfectly okay with shitting on liberals for actually legitimate reasons.
2) Liberals are obsessed with civility politics, they never allowed themselves to give Trump any real consequences. They regularly voted against their own measures, including Biden's own DOJ appointee vetoing the attempt to criminalize Trump for attempting a violent overthrow of the government. Simply because arresting your political opponents is uncivil, even if they commit crimes, so conservatives have a free pass to commit any crime they like.