Despite my initial use of a relay, and in respect to this thread, I did some testing.
I've found
these resistors can dissipate heat so well they don't even get that warm even with very high capacitance (those of you with 7uf or so). They are really nice because you can chassis mount them with heat paste. If you are concerned about heat just double the amount of resistors you are using to achieve similar resistance rating. They appear to operate, while attached to a chassis, all the way down to 2kohm on AC mains, but I'd recommend two 3kohm or other combination to er on super safe, if you needed that much bleeding. Most of you probably won't need anywhere near that.
While the threat of prosecution is up, you would be as much to blame over a poorly put together amplifier, anything, so I'm not going to suggest people not use capacitors in AC application. Just do it right, and if you are not sure check on here with people that know what is going on. Just know it is lethal, and puts other people at risk; like driving.