I have four daughters. Had I gone berserk and murdered them as children, I would be considered a hero dad who sent them straight to heaven?
This guy is more a kook than apologist for the faith. Depressing.
In all three of your examples the people being killed have lived some life, and they may be spiritually dead when they are killed and sent to Hell rather than to Heaven. This would never be the case with the unborn.
Since there was so much death in infancy for quite some time after the Crucifixion of Christ, I can see why so many churches favored infant baptism to remove one potential obstacle to those children going to Heaven.
The Catholic Church came up with the concept of Limbo for those humans, mostly babies, who died before they were baptized. Many non-Catholics believe this is a horrible concept no matter how nice Limbo is imagined to be. This, however, was an attempt to guess at a place for those without sin, but who didn't meet all the requirements for salvation (e.g. they didn't utter the magic words "I accept Jesus Christ as my Lord and Savior" while clicking their heels together three times.)