And this is why a lot of good points are lost.
People try and play the safety card and use hypothetical's to illustrate something that "might" happen.
It has all been trotted out before - when they got rid of radio operators and navigators, again when they got rid of the FE, when they went from four and three engines to two - and yet the predicted rain of aluminium from the sky has not eventuated.
The arguments that management understand are related to cost and commercial issues.
Lets face it, no sane professional pilot is going to depart with really low oil. It doesn't really matter what the "official" minimum level is, a quart or two below that level isnt going to cause an engine to run dry unless the engine is using an abnormal amount of oil - in which case the engine has a bigger problem than can be found on a pre dispatch inspection.
Make that argument about OTP and cost then you are going to get their attention. It might not change their mind as they are driven by different imperatives than the operational people including the threat that if they dont "perform" they are out (obviously at levels below the CEO because it seems that threat doesnt exist at that level).
Emotional arguments and those with hypotheticals are easy to ignore and often lead to good points being lost.
Figure out what is driving the management and frame your arguments accordingly.