Strikes do a few things.
1: they give workers what little dignity can be afforded to them in a capitalist system.
2: they show the flaw of our system.

When met with inflation that surpasses our wages what option is there other than to strike, and we can strike through many ways such as not paying our landlords on mass to impede plans to evict from or demolish our homes, we can strike paying utility's that raise our prices demonstrably, we can as civilian boycott all sorts of industry to demand change.
All strikes in one sence do fail, they'll give limited dignity ready to be steadily chipped away at giving way to a new struggle as we live in a system that function on indignity.

But in a socialist sense even the failed strikes are successful in other ways, they can show the inequality between worker and owner, renter and landlord, consumer and shareholder. Each strike is another nail in the coffin of capital and this is why we stand in solidarity with the people at Amazon, the ones working for Stagecoach and the G4S security at jobcenters earning near to minimal wage.

If you see a strike taking place then show them your civic support, bring drinks or have a chat, maybe even pick up a placard.