eidobunny and others have been saying if there's no incentive to fight the blood moon horde, then they'll just jump on a minibike, or tread water, or hide underground until morning. Consider if the time, effort, and risk versus reward of all those alternatives were, dare I say it, balanced.
The real issue is that all those horde-avoiding methods are holes in the game's design right now. I'm not saying they should all be disallowed. I'm saying they should be brought 'into the fold' so that, as eidobunny puts it, the game doesn't let the player optimize away the fun.
In other words, the game's answer to "well I'll just do this instead" should not be "oh no you won't." But it should be "that will be similarly challenging."