Because if they aren't opening their hearts as well as their wallets their little pity party isn't helping anyone but themselves. 10 seconds after clicking that like button they'll go back to not giving a single fuck about them.
The whole things is just really pretentious and their isn't a hint of there being any genuine concern.
Then there's the preachy vegetarian stuff about animal suffering, that stuff annoys me because I like bacon and don't really value the lives of animals. (although I do believe in making the slaugther as quick and painless as possible)
I apologize for the rant. I promise to not go on another in the near future.