They forget where Bitcoin was not 2 years ago, not 3 years ago, and as you point out, even 6 months ago. And when price does in the desired direction, no one questions manipulation, or how unsustainable it can be, how it's too fast, with not enough fundamental backing it up.
invest more, Don't worry that much as bitcoin have the history to comeback much stronger so if you can afford to add more on your assets while the
market still on this kind of situations then better to work it out and keep your optimistic point of views.