BANGKOK — The arrest last week of a high-profile journalist in the Philippines and a gag order against a Thai television station are the latest reminders that Southeast Asia’s press freedoms rest on the whims of governments. But after investors poured a record $145 billion into the region last year, there is little reason to think they will be deterred by the latest clampdowns. Last year’s inflow, recently reported by the United Nations Conference on Trade and Development, included an unprecedented sum for Vietnam, a one-party communist state. As usual, around half of the money went via Singapore, which has been ruled by the People’s Action Party since independence in 1965 and where reporting is stymied by prolific use of the courts against foreign critics of the ruling elites. “In general, if we compare to other factors — political stability, infrastructure, predictability of rules — [press freedom] is not a decisive factor” in investment moves, said Miha Hribernik, head of Asia politics research at Verisk Maplecoft. Nonetheless, a free press can at least inform business decisions, according to Ebb Hinchliffe, Executive Director of American Chamber of Commerce of the Philippines, and John D. Forbes, Senior Adviser to the chamber. “A responsible free press is more useful and important than a censored one for the purpose of being informed,” they said in an email.