The vast majority of laser collimators arrive needing collimation themselves, and before one may be used to collimate a telescope. If the laser is mis-collimated, mis-collimating of the telescope itself may occur.
I use passive tools to collimate my reflectors, and with excellent results. I have a laser-collimator myself, but I don't care for it. Conversely, others swear by them, particularly whilst employed within the barlowed-laser technique.
Passive tools consist of sight-tubes, Cheshires and collimation-caps...
https://garyseronik.com/a-beginners-...o-collimation/
https://garyseronik.com/collimation-...what-you-dont/
If you want to use a laser-collimator, do make certain that it's collimated...
https://www.youtube.com/results?sear...ser+collimator
Then, as you go up in magnification, up to the highest powers of which a given aperture is capable, the telescope has to work harder to produce sharp, pleasing images, therefore the collimation should be as precise as the mechanics of the telescope will allow.