There are some political reasons not to impeach Trump but there are really no substantive reasons anymore
I understand that the DOJ hasn't proven their allegations but the conventional wisdom is that the POTUS can't be indicted
If you accept that, you can't also say there is no evidence of criminal conduct because the president hasn't been convicted
Again, I understand the Senate would be unlikely to convict and it might be politically better for the Dems to talk about health care