Everybody makes mistakes, he rectified it by deleting his tweet. /s
Especially by a person who has a huge following and every word he writes can have a massive impact on peoples perception. As a lot of people pointed out, the term pedophile can be very damaging on one's life. Now put these two things together...
With great power, comes great responsibility. When you are a leader you have to be careful what you say and do. Granted, we are all human, but deleting a tweet doesn't even come close to an apology.
Always learning something new then.