I'm of the opinion that this is in direct response to how quickly 25,000 signatures were raised to fire Ortiz. How would they like it if the citizens of the US took the same tact: "Hey Obama administration, I'd like to inform you that I am choosing a different tax bracket arbitrarily with the same level of authority as you show me respect as a citizen."
For example, if I click on "popular petitions" right now, there are at least 5 petitions about the Westboro Baptist Chruch with more than 25k votes, and some of these are outright duplicates. Repealing Obamacare seems to be another popular topic.
Basically it seems that, because it is relatively easy to vote, you can find 25k people on the Internet to vote for more or less anything, overwhelming the administration with petitions that wouldn't actually find much support in the population.