In New York City – as with so many other places around the country – it’s generally a sadly accepted assumption that once a teacher in the public school system achieves tenure, they are in place for life. It doesn’t matter if you turn out to be a pedophile, a sexual predator or violent madman, thanks to the power of the teachers unions, your taxpayer funded paycheck is pretty much safe for life. At most, you might be sent to sit in a rubber room. Heck, in the current case of Sean Shaynak, you can collect your pay while...