We will never know if those tears were heartfelt (for whatever reason, the solemn atmosphere, the poignant moment in history, remembrance of a past loss etc etc) or forced.
But while his policies are causing untold misery and distress to the most vulnerable members of society it's very hard - if you actually care about what's happening - to see one of those most responsible expressing grief/concern/care/sadness/humanity (arguably ..) for any reason - even if those reasons are perfectly understandable, e.g. remembering the last funeral - perhaps of a dearly beloved relative - he attended. By all means let him react by shedding a tear - but for god's sake consider for a moment the 100s of 1000s, maybe millions whose lives are fast becoming a living misery ATM.
I often cry at funerals - I cry at news stories, or sometimes at TV tributes to people I obviously never knew, or didn't think I cared about previously. Sometimes the poignancy simply gets you - sometimes it's a reminder of our own mortality. But I've also cried at some of the stories I've read here lately - people trapped in utterly impossible situations who are being penalised for having "spare" bedrooms when, with the best will in the world, there is NOWHERE else for them to move to. Vulnerable people having the rug pulled out from beneath them - vulnerable people in specially adapted properties which they were given who are now told they must in effect pay an additional premium for.
It's very very hard to watch politicians responsible for casuing such huge distress expressing any sort of "normal" sympathetic emotion when at the same time they seem incapable of expressing sympathy and/or understanding for people in desperate need. That's why there's been various sneering posts on this thread - because people are beyond angry about what's happening, and when you see a politician demonstrating that under some circumstances (and arguably far far less important circumstances than all but destroying 100s of 1000s of lives - if he was crying for Thatcher then regardless of her position as significant world leader etc she was 87, had a good innings and so on, if he was crying for an individual close to him then we are talking one life v thousands) they can show a "human" side, it really sticks in your throat.