As I said in the previous thread,the belief that 'conversion therapy' is a science, or that it consistently works, is quite simply an invalid opinion. It is not supported by any credible shred of evidence, it has a thinly-veiled religious agenda, and it has been discredited about as thoroughly as any quack science. Freedom of speech is all well and good, but don't forget that it serves as a means to an end. Freedom of speech best allows us to root out bad ideas by challenging them. 'Conversion therapy' is one such idea that by any rational criterion has been utterly defeated. So on those grounds I find this decision quite appropriate.
To answer your question, mushroom, I imagine the people behind these adverts believe they are doing some form of greater good work, and therefore don't particularly care about offense. For them, what they're doing is to the benefit of humanity - a delusion which makes them rather immune to any form of scrutiny from others. So I doubt the problem of 'offence' really occurred to them.