Kevin is right. The local canyon behind my house has been completely blackened at least twice, with several smaller fires in the 35 years that I've been hiking it. In the last few years, they implemented a ban on open fires as they could not get everyone to be responsible. Even if only 1 in every 100 people was irresponsible with fire, that still leaves several people using fire dangerously there every weekend day. I'd rather just take the canister stove and keep my beautiful forest to hike in. There have been no fires since the ban was implemented.
What I am saying is that, despite being bummed that I cant't use my wood/alcohol/Esbit stove there, I understand why such bans were put into effect. Hopefully, they will never need to implement such rules in the Sierras.
There may be a small compromise here though. In my area they allow "jellied petroleum", in other words Sterno. Many people know that Sterno is actually jellied alcohol and even the rangers know this. I've been using my stove with the 2.6 oz Sterno can, and reconstituting it with Ethynol when I get back. It seems to burn hotter with the Ethynol, yet maintains the spill prevention qualities and the ability to extinguish it with the the lid. It boils 2 cups of water only about a minute slower than my Starlyte when used in the same configuration. Kind of inconvenient and a tad heavier, but still an ultralight alcohol stove.