I don't ascribe an inordinate amount of scrupples to the Saud's...outside of base selfishness any other reasons are second tier at best.
While low prices will cap fracking activity, the temporary layoffs are the only immediate result, long term what did the Saud's get if this was their goal? Do they think capped wells cannot be uncapped when prices start to rise again? Do they think everyone will be bankrupt and nobody will be patient? At some point their reserves deplete, and by continuing the glut they are hastening that day, what's their end game? And this hurts Russia more than the US, a larger segment of their economy thrives on the oil and gas industry, the US consumes more, but if the Saud's are willing to pump we are willing to buy, and when that stops we uncap the wells and frack away. The Saud's are sacrificing reserves today for market share tomorrow...but at some point demand will return (either by real economic growth or by the demands of war) and this exercise will be over.