The key thing is to be honest regarding how many times drugs have been used.
Too lazy to dig through the bowels of this forum, but a poster here in the last 6-9 months was dis-enrolled from AFROTC.
The reason why was on his exam he did say he had experimented with drugs, 1X. Later on he fessed up to experimenting more than 1X in HS, had not done in it college. He was drummed out immediately. There were 2 different thoughts on why.
1. He lied on his exam
2. 3X was more than experimentation.
Nobody knows the true # of how many times it is considered allowable.
Either way he was gone.
As far as preaching, I don't think anyone is preaching, it may read that way, but the fact is these posters have seen the forum littered with this question and it usually results in the same answer.
This is the new military...there are no shortages, not even close to it for any branch to have to accept/waive a candidate. 3 or 4, even 5 yrs ago, yes, they were waiving what appeared to be anything and everything, not now.
Look at even the stats for AFROTC scholarship applicants from 2012 to 2016 (we don't know 17 yet). The SAT scores increased by @50 points. Remember AFROTC is the only ROTC branch that does not superscore, it is best sitting. 50 point increase in a sitting as an avg is pretty significant.
They typically only award 20% of applicants any type of scholarship for HSSP. If for some reason candidates don't cut it on the DoDMERB, they can throw the money back into the pot for ISSP.
Thus, people aren't necessarily preaching they are informing on what the path will look like for them and the why behind their opinions.