Why don't some buddhists believe in karma and rebirth?

According to MN 60 and other suttas, believing in karma and afterlife is right view and believing that there is no karma and afterlife is unskillful and a wrong view because there is actually karma and next world. > "Now, householders, of those contemplatives & brahmans who hold this doctrine, hold this view — 'There is nothing given, nothing offered, nothing sacrificed. There is no fruit or result of good or bad actions. There is no this world, no next world, no mother, no father, no spontaneously reborn beings; no brahmans or contemplatives who, faring rightly and practicing rightly, proclaim this world and the next after having directly known and realized it for themselves' — it can be expected that, shunning these three skillful activities — good bodily conduct, good verbal conduct, good mental conduct — they will adopt & practice these three unskillful activities: bad bodily conduct, bad verbal conduct, bad mental conduct. Why is that? Because those venerable contemplatives & brahmans do not see, in unskillful activities, the drawbacks, the degradation, and the defilement; nor in skillful activities the rewards of renunciation, resembling cleansing. >"Because there actually is the next world, the view of one who thinks, 'There is no next world' is his wrong view. Because there actually is the next world, when he is resolved that 'There is no next world,' that is his wrong resolve. Because there actually is the next world, when he speaks the statement, 'There is no next world,' that is his wrong speech. Because there actually is the next world, when he says that 'There is no next world,' he makes himself an opponent to those arahants who know the next world. Because there actually is the next world, when he persuades another that 'There is no next world,' that is persuasion in what is not true Dhamma. And in that persuasion in what is not true Dhamma, he exalts himself and disparages others. Whatever good habituation he previously had is abandoned, while bad habituation is manifested. And this wrong view, wrong resolve, wrong speech, opposition to the arahants, persuasion in what is not true Dhamma, exaltation of self, & disparagement of others: These many evil, unskillful activities come into play, in dependence on wrong view. This actually make sense. For example, if someone tell you that your mother is dead because he actually saw your mother die then he is telling the truth but if you think that your mother is still alive and not dead then that is a wrong view because your mother is actually dead. In the same way, the Buddha has actually seen how karma works. It is mentioned in MN 36 and some other suttas. >"When the mind was thus concentrated, purified, bright, unblemished, rid of defilement, pliant, malleable, steady, & attained to imperturbability, I directed it to the knowledge of the passing away & reappearance of beings. I saw — by means of the divine eye, purified & surpassing the human — beings passing away & re-appearing, and I discerned how they are inferior & superior, beautiful & ugly, fortunate & unfortunate in accordance with their kamma: 'These beings — who were endowed with bad conduct of body, speech, & mind, who reviled the noble ones, held wrong views and undertook actions under the influence of wrong views — with the break-up of the body, after death, have re-appeared in the plane of deprivation, the bad destination, the lower realms, in hell. But these beings — who were endowed with good conduct of body, speech & mind, who did not revile the noble ones, who held right views and undertook actions under the influence of right views — with the break-up of the body, after death, have re-appeared in the good destinations, in the heavenly world.' Thus — by means of the divine eye, purified & surpassing the human — I saw beings passing away & re-appearing, and I discerned how they are inferior & superior, beautiful & ugly, fortunate & unfortunate in accordance with their kamma. So **my questions is why don't some buddhists believe in karma and rebirth**? The Kalama Sutta does tell us to only believe what we can experience ourself but even then you cannot deny karma and rebirth because it is possible to know them through the fourth jhana. So **why don't they just have the view "Karma and rebirth could be real" instead of denying them completely?** **Is it also kind of a counterfeit dharma if someone says that rebirth and karma are metaphorical and not real?**