But, My question is- When a low ranked user gets caught by others meriting his alts, I see DT members give harsh replies and expose them in a toxic way.
When a newbie does this, he's doing it for farming accounts, for using multiple users in whatever bounties or campaigns (usually against their rules) or for conducting scams.
Also in most cases those are not newbies, are established users' new accounts (btw, I guess that this is not your main account also, so you should know this kind of details).
On the other hand philipma1957 has proven already well enough that he's not interested in scams and these accounts have a clear purpose (you will see that at least Philipma1957cellphone is inactive now).
Plus his alts are clearly stated they're alts.
So it's by far an exception, in the good way. I would have not done that in his place (and if I would have had alts) even if that would have been meaning that for example I would not be able to post images, but being harsh on him for this would be really silly.
Hence I don't know why you are so keen to create this unnecessary drama.