I'm having difficult believing that someone is seriously
this stupid.
Regulated can be either a past tense verb or an adjective. In "well regulated militia," it is an adjective. There is no verb in "a well regulated militia."
Open a dictionary: Adj. 1. regulated - controlled or governed according to rule or principle or law; "well regulated industries"; "houses with regulated temperature"
Here's the entirety of the linked dictionary entry linked:
reg·u·late
ˈreɡyəˌlāt/
verb
past tense: regulated; past participle: regulated
control or maintain the rate or speed of (a machine or process) so that it operates properly.
"a hormone that regulates metabolism and organ function"
synonyms: control, adjust, manage
"the flow of the river has been regulated"
control or supervise (something, especially a company or business activity) by means of rules and regulations.
"the organization that regulates fishing in the region"
synonyms: supervise, police, monitor, check, check up on, be responsible for; More
set (a clock or other apparatus) according to an external standard.
Origin
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Or from first entry:
http://www.merriam-webster.com/dictionary/regulate
Full Definition of regulate
regulated regulating
transitive verb
1
a : to govern or direct according to rule
b (1) : to bring under the control of law or constituted authority (2) : to make regulations for or concerning <regulate the industries of a country>
2
: to bring order, method, or uniformity to <regulate one's habits>
3
: to fix or adjust the time, amount, degree, or rate of <regulate the pressure of a tire>
regulative play \-ˌlā-tiv\ adjective
regulatory play \-lə-ˌtȯr-ē\ adjective
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Notice where it lists adjectival forms.
Perhaps you can explain the details & nuances of word forms to make this diversion even less pertinent.