They can gas the Yemenis at will and even invade the whole country.. There is no reason for that they are showing restraint and humanism.. They can commit a horrible genocide if they wanted really
maybe in your wet dream fantasy the saudis can import gas and start gassing random civilians with western planes.... bin salman almost lost his throne when he pissed his western overlords off by daring to eliminate a political rival without washingtons permission.
also, they already have commited a genocide. with the embargo on food that is literally starving yemeni kids... the only thing thats done though, is make the houthis stronger and more popular...
the yemenis are a warrior people who have never kneeled against foreigners. they are absolutely legendary when it comes to resisting foreign aggressors... they are built differently...
the sauds are absolute cowards who thought they could win with money and resources..... unfortunately for them... no amount of money and resources can replace competent soldiers.... something the saudis sorely lack.