Bullshit, in this they are against stupid laws trying to handwave the
economic reality because "hurrr durrr green energy!!".
You are so far off base, you are on the wrong planet. The Koch bros are
about screw the planet, screw everyone else, even screw themselves for a
little short-sighted short-term monetary profit.
There are certain harsh economic realities that unfettered markets
do not deal with correctly. Generating energy from coal has great
negative externalities. IOW, the Koch bros are not paying for the
cost of dealing with all the pollution their plants generate.
Another thing unfettered markets don't deal with correctly is
limited resources. Those resources might be fossil fuels in
the ground or the capacity of the atmosphere to hold carbon
emissions without disastrous effects on the human race.
If the wisest policy involves not using up these
resources as fast as possible then unfettered markets don't
do the right thing.
Even if we accept your unstated assumption that the subsidies
of the fossil fuel industries do not dwarf those of
renewables, it still makes sense to subsidize renewables.
Partly due to the current subsidies, the cost of renewables
is dropping. It is in the best interest of the human
race to switch over to renewables before we run out of non-renewables
and before the waste products of non-renewables make the planet
uninhabitable.
Blind faith in the infallibility of markets is part and parcel
of the greed is good mentality that continues to wreak
havoc on our economy and on our social stability. These are the
harsh economic realities the Koch bros are ignoring.