When you talk to people with templates and threats, or
prejudge
that a person is a spammer or some kind of other offender, your
behaviour is no better than what you allege this peron to be doing.
Nonsense. For a start, seeing someone spam and concluding that the
person is a spammer is not prejudging, it's just judging. You don't
like threats? Should we not tell people that what they're doing will
get them blocked and just block them without warning? Or perhaps you
think blocking them is somehow unfair and we should just accept
whatever people do?
Templates are used for convenience. It is much quicker to type
{{subst:test}} than a couple of lines explaining why we want them to
stop. If you make vandal fighting harder you will reduce the number of
vandal fighters which will increase the length of time it takes for
vandalism to be found and fixed and increase the amount of vandalism
that gets missed completely. Not being very friendly to spammers and
vandals is a small price to pay to get vandalism fixed promptly.