None of which has anything to do with depriving young British citizens of their citezenship/human rights
It appears, to some, that this is fine if you can produce examples of other countries doing the same

However the Counter-Terrorism and Border Security Bill was given Royal Assent in February.
This bill puts a very different slant on the above

The main provisions included in the act are:

1)   a new power to stop, question, search and detain an individual at a port or border area to determine whether they are, or have been, involved in hostile state activity
2)    creating an offence of entering or remaining in an area outside the United Kingdom that has been designated by the Home Secretary if it is necessary for protecting the public from terrorism
3)   updating the offence of obtaining information likely to be useful to a terrorist to cover material that is only viewed or streamed, rather than downloaded to form a permanent record
4)   an increase to the maximum penalty for certain preparatory terrorism offences to 15 years’ imprisonment
5)   extending the offence of inviting support for a proscribed organisation
6) a requirement for terrorist offenders to provide additional information to the police in line with what registered sex offenders must provide

Simply having been in Syria can now be construed as a criminal activity if a UK citizen.