To be fair, I do consider the separation of Scotland from the rest of the UK as damaging to all.
Not only do I disagree with the indy Scots like the SNP, I strongly disagree with the (mostly English) elements that take the view "stuff the Scots, let 'em go if they want to!"
I'm a product of mixed heritage between three of the four nations of the UK, so I feel very personally that the three nations on the mainland at least should remain together and will ultimately all suffer if apart. I consider them all together as my "homeland", and will always feel that whether I go to London, Edinburgh or Cardiff, they are all MY people and country, whatever nonsense sectarian politicians try to divide their people.
Northern Ireland is a different matter as I recognise it's been much more sensitive and problematic, with divisions and severe sectarian violence even up to recent years (and still periodically breaking out), so I understand that being a much more live concern for the possibility of independence, especially given the demographic shift between Catholic and Protestant populations.