Johnybravo, I do not agree with you on the specific issue of the process of SPV mining being unstable in itself, I rather think it is the people who code it that flagrantly implement it - and that is a nod with particular reference to the mentioned forking.
On top of that, forking is not exclusively caused by SPV mining but more importantly there's no harm to "rest of us" when a fork of this nature happens. Infact, forks do happen and the protocol knows about it, thus it can not, by definition, be detrimental.
Well it only takes one miner to produce a block with 1 bad transaction in it, and that can push ~65% of the mining power off the bitcoin blockchain.
Not detrimental?
The law covers the issue of dealing with someone killing someone else.
However, killing someone else is usually considered detrimental ...... by definition.