I agree with piprabbit - the celebrations remind me of the people cheering the death of Saddam Hussein and I found that fairly unpleasant, even given what he had done.
Margaret Thatcher was an elected leader - elected three times - at an incredibly difficult time. I don't think everything she did was right, or rather she and her government did, because she wasn't a military dictator and could have been ousted by her party at any time if she was genuinely working against what everyone else in her government believed, but I strongly suspect that whoever was in power at the time would have found themselves making some of the same decisions.
I don't even believe that most people celebrating her death even care that much - it's just a way for people to be involved in the Big Thing of the moment, or possibly just a justification for causing carnage.
People need to be able to separate individuals from their role in government. I don't believe that any individual politician can be blamed or credited for any individual change - there are many people involved in everything decision made for the country. I also think it's incredibly easy for other parties to make capital out of an unpopular government - oh we wouldn't have done that, you should have elected us. But a fair chunk of the time, there isn't much difference to the meat of any decision, just to the way it's dressed up.
My profession is currently facing proposals that will decimate not only the profession, but also a vital part of our legal system. This is the second attempt to introduce these measures - the last was by a labour government. The Tories stated that if they gained power they would not introduce these measures, although they wouldn't stop them if they were already underway. The proposals collapsed (because they were badly thought-out bollocks) and guess what? A few years down the line and the Tories are trying to bring them in under their own steam.
Some of the things MT did would have happened anyway - not all, but some. There are criticisms to be levelled at her government about the way they went about things, but to suggest that MT was single-handedly responsible for all the things that happened, or were begun, in her era, is incredibly simplistic, and suggests that a fair swathe of the country just wants a bogeyman to band together against.