I don't quite share your distain for all thieves, btw. If you've been at the wrong end of society, I see no particular reason why you should be unduly worried about people who have much more than you losing some stuff. Again, back to game theory: if the world's being unjust to me, I'd be stupid to carry on being just to it indefinitely.
It's not an abstract like the world a thief is taking it out on, it's another human being. Maybe they've worked hard for what they have, maybe not. Maybe what the thief takes is of great value to them. Point is, the thief doesn't know, and attacks some else's security and peace of mind for his or her own purposes.
Taking off faceless companies can be a step down that road. Even if it isn't, if property rights aren't absolute, it's individuals who'll suffer from the attitude of "take what I want", not the big companies, just like it's the poor who suffer most at the hands of criminals.
I'm not up on game theory, but "treating as you'd like to be treated" is not thieving off the thief. It isn't making sure his potential victim has less stuff. A country could have excellent child care and still be unequal. Compassion and decency, not equality, are the key.
But as I said in parentheses above, the moronic drug laws are responsible for a huge chunk of crime – both those convicted of drug crimes and those who steal to fund a habit. In 1900 there was no such prohibition, so you need to factor that in before you can make a meaningful comparison.
You're right about prohibition, and I used to employ a mechanistic "prohibition = crime" argument. I'm not so sure now. Why turn to chemical oblivion? There has to be an underlying cause. I suspect we'd have a serious drugs problem if everything was on sale over the counter, or heroin was freely available from GPs. Something deeper than the law of the market is going on here.
As for advertising, I doubt there's a comprehensive survey available, but in old photographs you can see cities, trams and stations plastered with the stuff.
The 1867 and 1884 Reform Acts specified householders and people paying £10 rent for unfurnished rooms. Don't think they required the householder to own their property: if that was the case, most of the government would have been disenfranchised! (Renting or, for the more wealthy, leasing for a few years was the norm.) Not sure how disenfranchisement tallied with poverty: male lodgers and males who weren't householders were denied the vote, amongst others.