They committed wilful acts of civil disobedience. Like many activists they wanted to get arrested. They took great risk to their body and mind to do so for women's equality. It's not the same as pardoning gay people because they were prosecuted for a "crime" we now know is wrong (and is no longer a crime) totally different for the reasons the sufferagettes were arrested.
It doesn't change anything, it doesn't undo the abuse they received, it's just white washing history for public relations reasons. I don't think they'd be impressed.