The whole telemarketing scam is based on one simple fact, someone sold your name and/or number to someone willing to buy it, for the sole purpose of contacting you at home, in hopes of selling you something you never inquired about in the first place, the whole concept should be illegal, that's my opinion along with anyone who's ever had to get their name and number on a don't call list. Nobody who's name was ever sold, willingly put it out there, the only thing they did wrong was to have a phone line.
Many need to have a phone, for a lot of reasons, most involving safety and to stay in touch and get help in case of an emergency, in a lot of ways, for some of us, we have kids/grandkids, not living across town or next door, aging parents the same way, miles or state's away and the phone is a safety line to allow some to stay in their home due to their age and living on their own a whole lot longer than generations past and to remain in contact with family and friends. Plus a couple hundred more reasons it would take pages to type up but each has their own reasons.
Now the way it should be done, but apparently individuals don't have enough rights anymore, is to ask when you apply for a phone line, can your name and number be given out, if the answer is no, then if for some reason, it does get sold and out, SOMEONE should be held liable, but as of yet, that's not the case, its so normal now to let anything leak out, from personal data to credit card numbers to banking account information to your phone number to telemarketer scams, nobody is ever held liable, after all peoples jobs/income depends on this information being leaked out/sold.
Now for those doing the calling and working for those business's that are in this line of work in the first place, or forced out due to the don't call lists, I'd think it would be obvious, after all, the customers have spoken, maybe its time these individuals/business's start listening, people flat out don't want their homes and lives invaded by shady individuals attempting their scam and invading their homes and personal space taking up/wasting their time,all in the name of selling or scamming something via the phone, but maybe its just me.............no I'm thinking its hundreds of thousands up into the millions who have their name on a don't call list.
As for people making a living and jobs associated with it, there are all types of work be do, ones own personal integrity will determine what they feel is right and what's wrong and how they choose to live their lives, that is indeed a personal choice, it might be best not to attempt to justify their choice by asking those sick of being harassed to be nicer and kinder to them, after all, nobody is paying the victims/potential customers for their time and none certainly never asked to be called. Just a thought to ponder over.