I thought the argument of bypassing FRP security helps the bad guys to sound kind of 'hypocritaca'l as what is 'removeing' all the rest of the security to root a phone, in all reality it's the same thing.
You're making some erroneous assumptions there, Jason. Rooting and bypassing FRP are not the same at all.
As to the original argument, FRP is a security protocol specifically implemented to prevent device and/or data theft. There are only two reasons to bypass it. One, a legitimate device owner has created a situation where they are locked out of their rightful device. This can and does happen for several reasons. Most of the time the carrier or phone manufacturer will help them recover. The other reason is because the phone/device does not belong to you but you want to use/sell it anyway. That is specifically what FRP tries to prevent. Helping *anyone* bypass that in a public forum situation is effectively helping *everyone* bypass it.
Rooting, on the other hand, is simply gaining administrative access to the file system. It doesn't change very much about the phone or the installed software, although some apps that require specific security (like banking or credit card apps) may not work on a rooted device. As to your argument about carriers losing money, it's certainly not the case. They do get paid by other companies to include software on their devices which they get when a device is sold. They don't give it back if that device is then rooted. And they might have pay-per-use services embedded which rooting might be able to remove or disable, but then if the user is rooting to get rid of them then there's no use so the manufacturer or carrier is out nothing.
There have been attempts to legislate the practice of rooting as illegal, but they could never get it to stick. What rooting may be is a violation of the terms of use which may invalidate a warranty or have the carrier or manufacturer refuse support or service, but that's about it. Those risks are clearly outlined in almost every rooting how-to i've ever seen, including the risk of completely bricking the phone.
Now, there are apps that require root that can do some very bad things like hack games to cheat or receive paid services for free, or to modify phone identification like IMEI or ESN numbers (which is illegal in many jurisdictions). We do not permit discussion of those. But that's not to say that root is doing the bad stuff.