Should I buy the 2 year Apple Care, for my Macbook Pro with faulty butterfly switches?
Unfortunately, it's too late to buy AppleCare for you MacBook Pro. From Apple's MacBook AppleCare page:


  Purchase AppleCare+ with your new Mac. Or buy it within 60 days of your Mac purchase:


If you are at all concerned about the faulty switch, you should get it to Apple before the one year warranty runs out.