"House Investigations" are very much like "Grand Jury Investigations" and there is absolutely no requirement that "Grand Jury Investigations" be "fair". After all, the Grand Jury only hears ONE side of the case (and hears that side WITHOUT any chance of a rebuttal).
PS - Did you know that all countries except two have abandoned "Grand Juries". One of those countries is the United States of America - the other is Liberia.
Liberia is the 120 least corrupt nation out of 175 countries -
The United States is the 22 least corrupt nation out of 175 countries.
Liberia has an aggregate freedom
score of 62/100 - the US has an aggregate freedom
score of 86/100.
However, you comment overlooks that basic tenet of (popular) American Law which is
IF I support "X" then "X" is **I*N*N*O*C*E*N*T** until AFTER such time as they have been indicted, have been tried, have been convicted, have exhausted all possible (regardless of how frivolous) appeals without overturning the unjustly imposed conviction, AND it has been 100% established that there was 0.00% chance of any deliberate miscarriage of justice - HOWEVER IF I do NOT support "Y" then "Y" is **G*U*I*L*T*Y** regardless of any evidence to the contrary and without any need for stupid, silly, archaic, things like indictments, trials, convictions, or anything else just as long as someone even hints that they might possibly have done something that could, potentially, under some incredibly bizarre circumstances which do not actually apply..
What you have to remember is this
If "X" is the President of the United States of America and was nominated by the "A" party, then the "A" party will not give a damn what "X" does while the "B" party will oppose it 100% and make every effort to show that whatever "X" does is illegal. However if that same "X" had done the same things while President of the United States of America after being nominated by the "B" party, then the "B" party would not give a damn what "X" did while the "A" party would oppose it 100% and make every effort to show that whatever "X" did was illegal.
You can feel free to substitute "Republican" or "Democrat" for "A" and "B" in whatever sequence you feel like using.