The US says that Ukraine has 12 HIMARS. Soon they'll have 16 - another four were announced a few hours ago
U.S. to send four more HIMARS to Ukraine Some of the 12 are probably reserved for training, so maybe your figure of 8 is for the ones which are in use on the front line? Where did you read it?
When you say "we" what you really mean is "Biden". The US has the biggest stocks of HIMARS and the HIMARS factories. Biden's power is limited. The Republicans oppose him on pretty much everything, just to see him fail. It doesn't matter that a Ukraine victory would be good for the world. All the Republicans care about is beating the Democrats in 2024. It suits them to play to the MAGA crowd who say "Europe should sort out its own problems, all we care about is petrol prices". It suits them to frighten TV viewers by parroting Putin and Lavrov's propaganda about red lines and nukes. That's how fucked up America is these days. That's why the approval and delivery of HIMARS for Ukraine has been so agonisingly slow. A lot of Ukrainian lives could have been saved if the 16 systems had been approved 3 months ago.
And now Poland, Estonia, Latvia, Lithuania and Australia want to buy HIMARS. But there aren't huge stocks of launchers and ammunition in warehouses. They're also quite expensive - about $1.5m per launcher, plus a six figure price for every single missile (I think - there are many different types -
kebabking probably knows the prices of the types which Ukraine is getting.) So it's hard to see how the 16 launchers could grow to 100.