strict validation is way overrated, very few care for it, and even less ever notice it.
If it wasn't for people like you, there would be many more - and better - browsers today and it would also be a lot easier and faster to develop web sites.
Today's browsers must be made idiot proof, thanks to idiots (Microsoft, Tito, etc.) that don't follow the standards.
If you don't follow the standards you slow down the development of the internet, you slow down internet browsers and computers, and are to be considered an enemy of the internet, computers and of the future of humans.
Indirectly this is causing computers to need more power, better motherboards and CPUs and more RAM thanks to you, which means they cost more. At the same time as you are slowing down my internet browser you are also denying poor people one way of educating themselves.
When you mess up your code you are also messing up everyone else's internet.
That doesn't mean I have anything against you tho. I just think that it is very ignorant not to follow the standards.