Because she is still respected/admired by some folks in Britain and the US.
They think it’s just some young lefties who are throwing a taper tantrum about unions. No. This woman was a vile abomination. People need to be factually aware of everything wrong she did, in order to respond to her supporters.
She protected politicians running a pedophile ring:
https://www.thedailybeast.com/how-thatchers-government-covered-up-a-vip-pedophile-ring/
https://news.sky.com/story/thatcher-turned-blind-eye-to-paedophile-mps-10368694
https://www.theguardian.com/politics/2015/feb/02/thatcher-peter-hayman-named-paedophile-archives