As in title if you will watch you will support writers and netflix not Henry Cavill. He decided to leave because of writers and today when season 3 promotion start he didn't use his social media to promote series like other actors which is quite telling. So everyone who writes about the last season and watching for Henry are really doing a huge favor to these talentless writers so they can create more stupid seasons but without him but with more of their stupid ideas instead. Logically, you'll show him more support or respect if you don't watch it by protesting the approach of netflix and their writers to Witcher books and by showing that he was right to leave the series.

Edit: In the end as the last of actors he posted a trailer on his social media