Well, they ship them internationally for the german mustang makeover, and some border patrol and police choose these horses. I don't see why that is wrong. Clearly they see something beneficial in the animals they have chosen. Maybe yours isn't right for the job, but that doesn't mean that none are.
Can you provide a source when you say they multiply at 20% per year? I ask because in the talk today they specifically said that they weren't sure what their growth rate was, and that in some cases it very low and in some very high, and in other cases not tracked at all. You can find that in the link the op posted if they keep the text from the live stream and go back and read over those parts.
You say you have your horse because you are buds, so why can't other people want to have a mustang as their bud too? There may not be 30,000 homes for mustangs as buds out there, but there are homes for some, so I don't see why it's wrong for the BLM to explore those options like they discussed in their talk.
Not to anyone specific but just in general,
I just think there's a lot of misinformation out here in general about what's going on. There were only 20-30 people watching the live stream so it seems people don't care about the facts the BLM can provide about the animals they have. I know I learned about how they distribute the animals, what make them qualify for long term holding, what happens to them as they age and die out there, hints as to what they are planning for the future, so many things. I pass judgement on most of this stuff, but regardless of what side you fall on being educated on things is important.
Sure anyone can agree or disagree with what the BLM has discussed in the talk via my summary, but if you want to talk about it and make judgement on it it might be best to hear it from the source yourself, at least I think it comes across better that way, like you know first hand what you are talking about.